CN104540099A - Terminal positioning method and evolutive serving mobile location center - Google Patents
Terminal positioning method and evolutive serving mobile location center Download PDFInfo
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- CN104540099A CN104540099A CN201410857697.4A CN201410857697A CN104540099A CN 104540099 A CN104540099 A CN 104540099A CN 201410857697 A CN201410857697 A CN 201410857697A CN 104540099 A CN104540099 A CN 104540099A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/025—Services making use of location information using location based information parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
- H04W64/003—Locating users or terminals or network equipment for network management purposes, e.g. mobility management locating network equipment
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Abstract
The invention discloses a terminal positioning method and an evolutive serving mobile location center (E-SMLC). The terminal positioning method comprises the steps that firstly, the E-SMLC determines a base station participating in positioning according to a received power measurement report; secondly, the E-SMLC instructs the base station participating in positioning to send a positioning reference signal and instructs a serving base station on a mobile terminal to report the receiving and sending time difference and the arrival angle of the mobile terminal; thirdly, the mobile terminal is positioned through the E-SMLC according to the transmission delay of the positioning reference signal measured by the mobile terminal and the receiving and sending time difference and the arrival angle which are reported by the serving base station on the mobile terminal. In this way, the mobile terminal is positioned through the E-SMLC by combining the receiving and sending time difference and the arrival angle which are reported by the serving base station on the mobile terminal with the transmission delay of the positioning reference signal of the base station participating in positioning, the OTDOA positioning technology is optimized, and positioning precision can be improved.
Description
Technical field
The present invention relates to wireless communication field, the Serving Mobile Location Center of particularly a kind of method of locating terminal and evolution.
Background technology
Along with developing rapidly of mobile communication technology, LTE (Long Term Evolution, Long Term Evolution) technology become the focus of the research communications field, and LTE mobile communication product comprehensive occuping market at last, corresponding LTE technology also will get a lot of applications.Location technology is as one of LTE important technology, its objective is to determine UE (User Equipment, subscriber equipment) i.e. the geographical position of mobile terminal, thus bring user more abundant mobile experience, such as: the business such as automobile navigation, target following, interactive entertainment, geographic information processing, traffic returns and amusement message, as can be seen here, positioning service business has been one of current most popular mobile communication application business, and research wireless location technology has very strong practical significance.
But in the field of wireless communication, due to the uncertainty of wireless channel, make wireless signal in transmitting procedure, receive the impact of the factors such as noise jamming, path loss, multipath fading, near-far interference, to power attenuation and the delay spread of wireless signal be caused, thus have influence on the positioning precision of wireless location system.
In order to reach high-precision network positions, also there is some new localization methods in LTE system, as OTDOA (Observed Time Difference Of Arrival, observe arrive the time difference), E-CID (Enhanced Cell-ID, the cell ID of evolution) and A-GNSS (Advanced Global NavitationSatellite System, advanced GLONASS (Global Navigation Satellite System)).Wherein, A-GNSS requires high to terminal hardware, the method to realize cost compare high; Although E-CID cost is low, can only rough estimate location of mobile station, namely positioning precision is poor; OTDOA location technology rather moderate, but its positioning precision is also very easily subject to the impact of environment, special in high-lager building comparatively multizone, radio propagation environment is bad, signal is difficult to directly arrive travelling carriage from base station, generally will, through superrefraction or reflection, therefore, OTDOA location technology be adopted to have impact on the precision of location in the present context.
Summary of the invention
The embodiment of the present invention provides a kind of method of terminal positioning and the Serving Mobile Location Center of evolution, in order to realize the optimization of OTDOA location technology to improve the precision of location.
The invention process provides a kind of method of terminal positioning, and the method comprises:
The Power Measurement Report that the Serving Mobile Location Center E-SMLC mobile terminal receive of evolution reports, according to the described Power Measurement Report received, determines the base station participating in location;
The described base station participating in location of described E-SMLC instruction sends location reference signals, the location reference signals indicating described mobile terminal to send for the described base station participating in location carries out the measurement of propagation delay time, and the transmitting-receiving time difference of mobile terminal described in the serving base stations report indicating described mobile terminal and angle of arrival;
The transmitting-receiving time difference of the serving base stations report of the propagation delay time of the described location reference signals that described E-SMLC measures according to described mobile terminal, described mobile terminal and angle of arrival, position described mobile terminal.
Preferably, according to the described Power Measurement Report received, determine the base station participating in location, specifically comprise:
Respectively the mean value of Reference Signal Received Power of each adjacent base station and the first threshold of setting are compared, if the former is greater than the latter, then the adjacent base station of correspondence and the serving BS of described mobile terminal are defined as the base station participating in location.
Preferably, described E-SMLC also comprises after indicating described mobile terminal to carry out the measurement of propagation delay time for the location reference signals that the described base station participating in location sends: indicate the described base station participating in location to stop sending location reference signals.
Preferably, described E-SMLC, according to the described Power Measurement Report received, after determining the base station participating in locating, also comprises:
If the Reference Signal Received Power participating in the base station of location is greater than the Second Threshold of setting, then the transmitting power of location reference signals reduces by the described described base station participating in location of E-SMLC instruction on the basis of default value; And/or
If the Reference Signal Received Power participating in the base station of location is less than the Second Threshold of setting, then the transmitting power of location reference signals improves by the described described base station participating in location of E-SMLC instruction on the basis of default value.
Preferably, described E-SMLC also comprises after indicating described mobile terminal to carry out the measurement of propagation delay time for the location reference signals that the described base station participating in location sends:
Difference operation is asked to the propagation delay time of the propagation delay time of base station and the serving BS of described mobile terminal that participate in location, obtains the transmission time delay difference of the base station participating in location;
Poor according to the propagation delay of the base station of described participation location, utilize hyperbola principle, determine at least two intersecting point coordinates;
Determine the abscissa of at least two intersecting point coordinates and the mean value of ordinate respectively, obtain the first coordinate of described mobile terminal.
Preferably, the transmitting-receiving time difference of the serving base stations report of the propagation delay time of the described location reference signals that described E-SMLC measures according to described mobile terminal, described mobile terminal and angle of arrival, position described mobile terminal, specifically comprise:
According to transmitting-receiving time difference and the angle of arrival of the serving base stations report of described mobile terminal, determine the second coordinate of described mobile terminal;
According to described first coordinate and described second coordinate, described mobile terminal is positioned.
Preferably, before the Power Measurement Report that E-SMLC mobile terminal receive reports, also comprise:
Described mobile terminal initiates Location Request to mobile management entity MME, or the network side server of other location initiates Location Request to needing the MME of the mobile terminal of locating, or MME independently initiates Location Request.
The embodiment of the present invention also provides a kind of Serving Mobile Location Center E-SMLC of evolution, comprising: receiver module, measurement module and locating module;
Described receiver module, for the Power Measurement Report that mobile terminal receive reports, according to the described Power Measurement Report received, determines the base station participating in location;
Described measurement module, be used to indicate the described base station participating in location and send location reference signals, the location reference signals indicating described mobile terminal to send for the described base station participating in location carries out the measurement of propagation delay time, and the transmitting-receiving time difference of mobile terminal described in the serving base stations report indicating described mobile terminal and angle of arrival;
Described locating module, for measure according to described mobile terminal the propagation delay time of described location reference signals, transmitting-receiving time difference of the serving base stations report of described mobile terminal and angle of arrival, described mobile terminal is positioned.
Preferably, described receiver module, specifically for:
Respectively the mean value of Reference Signal Received Power of each adjacent base station and the first threshold of setting are compared, if the former is greater than the latter, then the adjacent base station of correspondence and the serving BS of described mobile terminal are defined as the base station participating in location.
Preferably, described measurement module, also for:
After indicating described mobile terminal to carry out the measurement of propagation delay time for the location reference signals that the described base station participating in location sends, the described base station participating in location is indicated to stop sending location reference signals.
Preferably, described receiver module, also for:
If the Reference Signal Received Power participating in the base station of location is greater than the Second Threshold of setting, then the transmitting power of location reference signals reduces by the described described base station participating in location of E-SMLC instruction on the basis of default value; And/or
If the Reference Signal Received Power participating in the base station of location is less than the Second Threshold of setting, then the transmitting power of location reference signals improves by the described described base station participating in location of E-SMLC instruction on the basis of default value.
Preferably, described locating module, also for:
After indicating described mobile terminal to carry out the measurement of propagation delay time for the location reference signals that the described base station participating in location sends, difference operation is asked to the propagation delay time of the propagation delay time of base station and the serving BS of described mobile terminal that participate in location, obtains the transmission time delay difference of the base station participating in location;
Poor according to the propagation delay of the base station of described participation location, utilize hyperbola principle, determine at least two intersecting point coordinates;
Determine the abscissa of at least two intersecting point coordinates and the mean value of ordinate respectively, obtain the first coordinate of described mobile terminal.
Preferably, described locating module, specifically for:
According to transmitting-receiving time difference and the angle of arrival of the serving base stations report of described mobile terminal, determine the second coordinate of described mobile terminal;
According to described first coordinate and described second coordinate, described mobile terminal is positioned.
Preferably, described receiver module, also for:
Before the Power Measurement Report that mobile terminal receive reports, receive the Location Request that described mobile terminal is initiated to mobile management entity MME, or, receive the network side server of other location to the Location Request needing the MME of the mobile terminal of locating to initiate, or, receive the Location Request that MME independently initiates.
The method of the terminal positioning that the embodiment of the present invention provides and the Serving Mobile Location Center E-SMLC of evolution, the Power Measurement Report first reported by E-SMLC mobile terminal receive, according to the described Power Measurement Report received, determines the base station participating in location; Secondly E-SMLC instruction participates in the base station transmission location reference signals of location, indicating mobile terminal carries out the measurement of propagation delay time for the location reference signals that the described base station participating in location sends, and the transmitting-receiving time difference of the serving base stations report mobile terminal of indicating mobile terminal and angle of arrival; The propagation delay time of described location reference signals that E-SMLC measures according to mobile terminal, the transmitting-receiving time difference of the serving base stations report of mobile terminal and angle of arrival, mobile terminal is positioned, can find out, E-SMLC is by the transmitting-receiving time difference of the serving base stations report of mobile terminal and angle of arrival, combine with the propagation delay time participating in the location reference signals of base station of locating and mobile terminal positioned, OTDOA location technology is optimized, thus the precision of location can be improved.In addition, do not need to modify to agreement yet, be easy to realize.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly introduced, 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.
The flow chart of the method for locating terminal that Fig. 1 provides for the embodiment of the present invention;
Another flow chart of the method for locating terminal that Fig. 2 provides for the embodiment of the present invention;
The structural representation of the Serving Mobile Location Center of the evolution that Fig. 3 provides for the embodiment of the present invention.
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, and obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the flow chart of the method for locating terminal that the embodiment of the present invention provides.As shown in Figure 1, the method can comprise:
S101, E-SMLC (Evolved Serving Mobile Location Center, the Serving Mobile Location Center of evolution) Power Measurement Report that reports of mobile terminal receive and UE, according to the described Power Measurement Report received, determine the base station participating in location;
The base station that S102, E-SMLC instruction participates in location sends location reference signals, indicating mobile terminal carries out the measurement of propagation delay time for the location reference signals that the base station participating in location sends, and the transmitting-receiving time difference of mobile terminal described in the serving base stations report of indicating mobile terminal and angle of arrival;
Wherein, the transmitting-receiving time difference can refer to from the serving BS of the mobile terminal time required to the confirmation signal that the serving BS of mobile terminal receives mobile terminal to described mobile terminal sends signal; Also the time required to receiving the confirmation signal of serving BS transmission can referring to send signal from mobile terminal to serving BS; Angle of arrival refers to that mobile terminal is on the ray that described serving BS is starting point, and the angle value that ray is rotated counterclockwise from direct north.
The transmitting-receiving time difference of the propagation delay time of the location reference signals that S103, E-SMLC measure according to mobile terminal, the serving base stations report of mobile terminal and angle of arrival, position mobile terminal.
Further, before the Power Measurement Report that E-SMLC reports at mobile terminal receive, also Location Request can be received, this Location Request can be the Location Request that mobile terminal initiates to mobile management entity MME (MobilityManagement Enity, mobile management entity) to be forwarded to E-SMLC by MME again; Also can be that other network side server of locating initiates to needing the MME of the mobile terminal of locating the Location Request forwarded to E-SMLC by MME again, such as, network side server can be EPC LCSClient (Evolved Packet Core Network Location Service Client, the positioning service client of packet-based core networks); It can also be the Location Request that MME independently initiates to be forwarded to E-SMLC by MME again.
Further, the mean value of the Reference Signal Received Power of each adjacent base station and the first threshold preset compare by E-SMLC respectively, if the former is greater than the latter, then the adjacent base station of correspondence and the serving BS of described mobile terminal are defined as the base station participating in location.
Below by an example to the Reference Signal Received Power of E-SMLC according to each adjacent base station of mobile terminal reporting in nearest one-period, be how to determine that detailed explanation explanation is carried out in the base station participating in location.
Suppose that the serving BS of UE1 be the adjacent base station of base station A, UE1 is base station B, base station C and base station D, and UE1 is reported the RSRP of adjacent base station B by serving BS A in nearest one-period
b1(Reference Signal Receiving Power, Reference Signal Received Power) and RSRP
b2, UE1 reports the RSRP of adjacent base station C
c1and RSRP
c2, UE1 reports the RSRP of adjacent base station D
d1and RSRP
d2all be forwarded to E-SMLC, then the RSRP that the serving BS A that E-SMLC receives UE1 sends
b1, RSRP
b2, RSRP
c1, RSRP
c2, RSRP
d1and RSRP
d2after, to RSRP
b1and RSRP
b2to average computing, obtain RSRP
b is average; To RSRP
c1and RSRP
c2average after computing, obtain RSRP
c is average; To RSRP
d1and RSRP
d2average after computing, obtain RSRP
d is average.Further hypothesis RSRP
b is averageand RSRP
c puts down allbe greater than the first threshold preset, and RSRP
d is averagebe less than the first threshold preset, then base station B and base station C and serving BS A is only defined as the base station participating in location by E-SMLC.
Further, determine the base station participating in locating at E-SMLC after, OTDOA information can be sent to the base station participating in location, OTDOA information is a request message, object is that the let on base station of location reports PRS (Positioning Reference Signals, location reference signals) message, after E-SMLC receives the PRS message that reports of base station participating in location, be handed down to UE with assistance messages again, the ID of the base station participating in location in assistance messages, can be comprised.
In order to reduce near-far interference, participate in base station adjustable transmitting power separately before transmission location reference signals of location, if the Reference Signal Received Power participating in the base station of location is greater than the Second Threshold preset, then the transmitting power of location reference signals reduces by the base station that E-SMLC instruction participates in locating on the basis of default value; Otherwise if the Reference Signal Received Power participating in the base station of location is less than the Second Threshold preset, then the transmitting power of location reference signals improves by the base station that E-SMLC instruction participates in locating on the basis of default value; If the Reference Signal Received Power participating in the base station of location is identical with the Second Threshold preset, then E-SMLC does not send the base station being indicated to and participating in location, and location location reference signals is launched according to the default value of the transmitting power of location reference signals in the base station participating in location.In the specific implementation, the default value of the transmitting power of location reference signals and Second Threshold can be set to have certain corresponding relation.
In order to reach energy-conservation object, the location reference signals sent for the base station participating in location at E-SMLC indicating mobile terminal carries out before and after the measurement of propagation delay time, the base station participating in location also can be indicated to open and stop sending location reference signals.
Further, after E-SMLC indicating mobile terminal carries out the measurement of propagation delay time for the location reference signals that the base station participating in location sends, also difference operation is asked to the propagation delay time of the propagation delay time of base station and the serving BS of mobile terminal that participate in location, obtain the transmission time delay difference of the base station participating in location; Poor according to the propagation delay of the base station participating in location, utilize hyperbola principle, determine at least two intersecting point coordinates; Determine the abscissa of at least two intersecting point coordinates and the mean value of ordinate respectively, obtain the first coordinate of mobile terminal.According to transmitting-receiving time difference and the angle of arrival of the serving base stations report of mobile terminal, determine the second coordinate of mobile terminal; According to the first coordinate and the second coordinate, mobile terminal is positioned.
Below by an example, to transmitting-receiving time difference and the angle of arrival of the propagation delay time of the location reference signals that E-SMLC measures according to mobile terminal, the serving base stations report of mobile terminal, mobile terminal is positioned and carries out detailed explanation explanation.
Suppose that the serving BS of UE2 is base station E, 3 adjacent base stations of UE2 are base station G, base station F and base station K, position residing for UE2 is P point, and the position residing for serving BS E is E point, and the point of base station G, base station F and the position residing for the K of base station is respectively: G point, F point and K point; Further hypothesis base station G, base station F and base station K and serving BS E are the base station participating in location.First, E-SMLC sends supplementary to UE2, supplementary includes the ID of serving BS E, base station G, base station F and base station K, secondly, the propagation delay that UE2 obtains according to the location reference signals that serving BS E, base station G, base station F and base station K send the location reference signals that serving BS E, base station G, base station F and base station K send is respectively: T
e, T
g, T
fand T
k; And the propagation delay T that will estimate
e, T
g, T
fand T
ksend to E-SMLC.When E-SMLC receives the location reference signals propagation delay time T of UE2 transmission
e, T
g, T
fand T
kafter, with serving BS E for reference point is namely with T
eobject as a reference, calculation base station G, the propagation delay difference of base station F and base station K respectively and between serving BS E are T respectively
eF, T
eG,and T
eK, wherein T
eFfor T
ewith T
fbetween difference, T
eGfor T
ewith T
gbetween difference, T
eKfor T
ewith T
kbetween difference.
Utilize hyperbola principle, show that focal length is respectively EF, EG, EK, and UE2 divides and is clipped to base station E, base station F, the difference of the distance of base station G and base station K meets the following conditions:
dPE-dPF＝T
EF*C＝2a1；
dPE-dPG＝T
EG*C＝2a2；
dPE-dPK＝T
EK*C＝2a3；
Wherein C is the light velocity, 300000000m/s; 2a1 represent P point to base station E be P point to the range difference of base station F and the value of a1 to base station E with the distance value to base station F divided by the value of 2 later gained; 2a2 represent P point to base station E be P point to the range difference of base station G and the value of a2 to base station E with the distance value to base station G divided by the value of 2 later gained; 2a3 represent P point to base station E be P point to the range difference of base station K and the value of a3 to base station E with the distance value to base station K divided by the value of 2 later gained.
Due to the known distance relation between each base station, draw:
dEF＝2c1；
dEG＝2c2；
dEK＝2c3；
Wherein, 2c1 represents that the distance of base station E and base station F and the value of c1 are the value of the distance value between base station E and base station F divided by 2 later gained; 2c2 represents that the distance of base station E and base station G and the value of c2 are the value of the distance value between base station E and base station G divided by 2 later gained; 2c3 represents that the distance of base station E and base station K and the value of c3 are the value of the distance value between base station E and base station K divided by 2 later gained;
According to formula (c*c-a*a) * (x*x)-(a*a) * (y*y)=(a*a) (c*c – a*a);
Can show that the expression formula [1] of hyperbola 1 is:
(c
1*c
1-a
1*a
1)*(x*x)-(a
1*a
1)*(y*y)＝(a
1*a
1)(c
1*c
1–a
1*a
1)；
The expression formula [2] of hyperbola 2 is:
(c
2*c
2-a
2*a
2)*(x*x)-(a
2*a
2)*(y*y)＝(a
2*a
2)(c
2*c
2–a
2*a
2)；
The expression formula [3] of hyperbola 3 is:
(c
3*c
3-a
3*a
3)*(x*x)-(a
3*a
3)*(y*y)＝(a
3*a
3)(c
3*c
3–a
3*a
3)。
According to the expression formula [1] of above-mentioned hyperbola 1 and the expression formula [2] of hyperbola 2, an intersecting point coordinate can be determined, for the purpose of being described clearly, this intersecting point coordinate is designated as the first intersection point (x1, y1); According to the expression formula [1] of above-mentioned hyperbola 1 and the expression formula [3] of hyperbola 3, also can determine an intersecting point coordinate, in order to distinguish with above-mentioned intersecting point coordinate, this intersecting point coordinate be designated as the second intersecting point coordinate (x2, y2); Average after computing to abscissa x1 and x2, ordinate y1 and y2 of the first intersection point (x1, y1) and the second intersecting point coordinate (x2, y2) respectively, obtain the coordinate (x, y) at UE3 place and preserve; Wherein, x is that x1 and x2 averages the value obtained after computing; Y is that y1 and y2 averages the value obtained after computing.
Then, then according to the T of serving base stations report
aDV(Timing Advance, transmitting-receiving time difference) and AOA (Angle of Arrival, angle of arrival) principle can calculate:
Assuming that the air line distance of serving BS E base station and UE3 is d, draw: d=C*T
aDV/ 2;
The angular relationship that AOA measures is r, show that acute angle relation is a=r-270;
Utilize sine and cosine theorem can draw the position dy=d*Sina of UE3; Dx=d*Cona;
E-SMLC combines (x, the y) that preserve and dx below more above, and dy, easily can infer the accurate location of UE3.
Further, after E-SMLC calculates the accurate location of mobile terminal, the positional information of mobile terminal can feed back to Location Request side; Initiate if Location Request is mobile terminal, just feed back to mobile terminal; Initiate if Location Request is mobile terminal the Location Request that forwarded to E-SMLC by MME again to MME, then the location information of mobile terminal obtained is fed back to mobile terminal; If the network side server that Location Request is other location initiates to needing the MME of the mobile terminal of locating the Location Request forwarded to E-SMLC by MME again, then the location information of mobile terminal obtained is fed back to network side server; If Location Request independently initiates by MME the Location Request that forwarded to E-SMLC by MME again, then the location information of mobile terminal obtained is fed back to MME.
Initiate Location Request with UE3 to serving MME below, then be forwarded to E-SMLC by MME, how E-SMLC positions UE3, provides detailed flow process.As shown in Figure 2, this flow process is as follows:
S201, UE3 initiate Location Request to serving MME;
This Location Request is forwarded to E-SMLC by S202, serving MME;
S203, E-SMLC send stationkeeping ability request to UE3;
Further, E-SMLC sends stationkeeping ability request to determine whether UE3 has the function of location by LPP agreement to UE3.
S204, UE3 report its stationkeeping ability to E-SMLC;
S205, E-SMLC send periodic power to serving BS and measure request;
Further, E-SMLC sends periodic power request of measuring by LPPa agreement to serving BS and receives to determine whether serving BS possesses the function that UE3 reports RSRP.
S206, serving BS reply the centre of location according to self measurement capability, and this message is not with any measurement result;
Above-mentioned measurement capability refers to whether serving BS possesses the RSRP function receiving UE and report.
S207, UE3 report the RSRP of the RSRP of serving BS and adjacent base station;
Further, UE3 reports UE3 to RSRP and UE3 of serving BS to the RSRP of adjacent base station by RRC information;
The RSRP to serving BS that S208, serving BS cyclical process UE3 report and the RSRP to adjacent base station, adopt mean value method respectively to the measurement result of each adjacent base station of UE3 in nearest one-period, the RSRP obtained after being calculated by the employing mean value method of each base station reports E-SMLC;
The time span of above-mentioned one-period is more than or equal to the time span that UE3 reports the cycle of RSRP, and such as, the value of above-mentioned one-period can be the twice or three times that UE3 reports the RSRP cycle.
S209a, E-SMLC, according to the RSRP of serving base stations report, select from UE3 nearest, and the strongest several base stations of UE3 received power participate in location; Meanwhile, E-SMLC sends a notification message to serving BS;
S209b, E-SMLC send a notification message to the adjacent base station determining the UE3 participating in location.
In the specific implementation, two adjacent base stations of UE3 will at least be selected.
The base station of S210, all participations location, according to the notice of E-SMLC, adjusts the transmitting power of respective location reference signals;
S211a, serving BS adjustment location reference signals transmitting power complete after, by LPPa Protocol answers confirm adjustment message to E-SMLC, with make E-SMLC confirm adjustment complete.
The adjacent base station of the UE3 of S211b, participation location sends to E-SMLC and confirms adjustment message;
The base station of S212, all participations location is opened and is sent location reference signals;
After the acknowledge message that the base station that S213, E-SMLC receive participation location sends respectively, send assistance messages to UE3, described assistance messages includes the ID of the base station participating in location.
Described assistance messages is used to indicate measurement cell set and the location reference signals relevant information that UE3 needs concern;
S214, UE3 receive E-SMLC send notice UE3 need pay close attention to measurement cell set and location reference signals relevant information after, start according to time delay estimate calculate participate in location base station send location reference signals propagation delay;
The propagation delay of the location reference signals of the base station that the participation calculated is located by S215, UE3 sends to E-SMLC;
After S216a, E-SMLC receive the result that UE3 reports, location reference signals is closed in notification service base station, to reach energy-conservation object, and without the need to increasing new protocol message, realizes simple;
Wherein, after E-SMLC receives the result that UE3 reports, then location reference signals is closed in the base station that notice participates in location, comprising:
After S216b, E-SMLC receive the result that UE3 reports, notify that remaining determines that location reference signals is closed in the adjacent base station of the UE3 participating in location;
After S217, each base station participating in locating receive and close message, stop respectively sending corresponding location reference signals;
S218, E-SMLC indicate the serving base stations report T of UE3
aDVwith mobile terminal AOA information, and the self-ability of foundation serving BS and UE ability determine T
aDVreport form.
S219, serving BS, according to the instruction of E-SMLC, send measurement configuration request message by RRC (Radio Resource Controller, wireless heterogeneous networks) signaling; Can comprise the transmitting-receiving time difference that request UE3 sends UE3 in this measurement configuration request, the transmitting-receiving time difference of UE3 refers to the time span that UE3 is required to the acknowledge message receiving serving BS from sending signal to serving BS;
S220, UE3 send measurement report, comprise the transmitting-receiving time difference of UE3 in this measurement report;
After S221, serving BS receive the measurement report of UE3 reply, start the transmitting-receiving time difference T of calculation services base station
aDV, and the angle of arrival AOA information between UE3 and serving BS;
Wherein, the transmitting-receiving time difference T of serving BS
aDVrefer to time span required to receiving serving BS and receiving the acknowledge message of UE3 sending signal from serving BS to UE3;
In theory, the transmitting-receiving time difference of UE3 is identical with the transmitting-receiving time difference of serving BS, in the specific implementation, if the transmitting-receiving time difference of UE3 is identical with the transmitting-receiving time difference of serving BS, can send the transmitting-receiving time difference T of serving BS to E-SMLC
aDV, or the transmitting-receiving time difference of UE3 is sent to E-SMLC; If the transmitting-receiving time difference of UE3 is different from the transmitting-receiving time difference of serving BS, then by the transmitting-receiving time difference T of serving BS
aDVsend to E-SMLC.
In the present embodiment, suppose that serving BS is by the transmitting-receiving time difference T of serving BS
aDVsend to E-SMLC.
S222, serving BS are by the T by calculating
aDVe-SMLC is sent to AOA;
The transmitting-receiving time difference that S223, E-SMLC send in step S215 according to UE3, utilize hyperbola principle can calculate first coordinate of UE3; Then, the T then according to serving BS sent
aDVsecond coordinate of UE3 can be calculated with AOA.
First coordinate and the second coordinate are combined, the accurate location of UE3 can be calculated.The embodiment of the present invention provides detailed description to concrete computational process, is not described in detail in this.
S224, E-SMLC send to UE3 by the positional information of the UE3 calculated.
In above-mentioned flow process, the communication between UE3 and E-SMLC communicates by LPP agreement, and the communication protocol also by other communicates; Communication between serving BS with E-SMLC communicates by LPPa agreement, and the communication protocol also by other communicates.
The method of the terminal positioning that the embodiment of the present invention provides, the Power Measurement Report first reported by E-SMLC mobile terminal receive, according to the described Power Measurement Report received, determines the base station participating in location; Secondly E-SMLC instruction participates in the base station transmission location reference signals of location, indicating mobile terminal carries out the measurement of propagation delay time for the location reference signals that the described base station participating in location sends, and the transmitting-receiving time difference of the serving base stations report mobile terminal of indicating mobile terminal and angle of arrival; The propagation delay time of described location reference signals that E-SMLC measures according to mobile terminal, the transmitting-receiving time difference of the serving base stations report of mobile terminal and angle of arrival, mobile terminal is positioned, can find out, E-SMLC is by the transmitting-receiving time difference of the serving base stations report of mobile terminal and angle of arrival, combine with the propagation delay time participating in the location reference signals of base station of locating and mobile terminal positioned, OTDOA location technology is optimized, thus the precision of location can be improved.In addition, because the base station participating in location can adjust the transmitting power of location reference signals, therefore, near-far interference can also be reduced.
Based on identical technical conceive, the embodiment of the present invention also provides a kind of Serving Mobile Location Center E-SMLC of evolution, and the Serving Mobile Location Center of this evolution can perform said method embodiment.The structural representation of the Serving Mobile Location Center of the evolution that the embodiment of the present invention provides, as shown in Figure 3.Comprise: receiver module 31, measurement module 32 and locating module 33.
Receiver module 31, for the Power Measurement Report that mobile terminal receive reports, according to the described Power Measurement Report received, determines the base station participating in location;
Measurement module 32, be used to indicate the described base station participating in location and send location reference signals, the location reference signals indicating described mobile terminal to send for the described base station participating in location carries out the measurement of propagation delay time, and the transmitting-receiving time difference of mobile terminal described in the serving base stations report indicating described mobile terminal and angle of arrival;
Locating module 33, for measure according to described mobile terminal the propagation delay time of described location reference signals, transmitting-receiving time difference of the serving base stations report of described mobile terminal and angle of arrival, described mobile terminal is positioned.
Further, 31 receiver modules, specifically for:
Respectively the mean value of Reference Signal Received Power of each adjacent base station and the first threshold of setting are compared, if the former is greater than the latter, then the adjacent base station of correspondence and the serving BS of described mobile terminal are defined as the base station participating in location.
Further, measurement module 32, also for:
After indicating described mobile terminal to carry out the measurement of propagation delay time for the location reference signals that the described base station participating in location sends, the described base station participating in location is indicated to stop sending location reference signals.
Further, receiver module 31, also for:
If the Reference Signal Received Power participating in the base station of location is greater than the Second Threshold of setting, then the transmitting power of location reference signals reduces by the described described base station participating in location of E-SMLC instruction on the basis of default value; And/or
If the Reference Signal Received Power participating in the base station of location is less than the Second Threshold of setting, then the transmitting power of location reference signals improves by the described described base station participating in location of E-SMLC instruction on the basis of default value.
Further, locating module 33, also for:
After indicating described mobile terminal to carry out the measurement of propagation delay time for the location reference signals that the described base station participating in location sends, difference operation is asked to the propagation delay time of the propagation delay time of base station and the serving BS of described mobile terminal that participate in location, obtains the transmission time delay difference of the base station participating in location;
Poor according to the propagation delay of the base station of described participation location, utilize hyperbola principle, determine at least two intersecting point coordinates;
Determine the abscissa of at least two intersecting point coordinates and the mean value of ordinate respectively, obtain the first coordinate of described mobile terminal.
Further, locating module 33, specifically for:
According to transmitting-receiving time difference and the angle of arrival of the serving base stations report of described mobile terminal, determine the second coordinate of described mobile terminal;
According to described first coordinate and described second coordinate, described mobile terminal is positioned.
Further, receiver module 31, also for:
Before the Power Measurement Report that mobile terminal receive reports, receive the Location Request that described mobile terminal is initiated to mobile management entity MME, or, receive the network side server of other location to the Location Request needing the MME of the mobile terminal of locating to initiate, or, receive the Location Request that MME independently initiates.
To sum up, the method for the terminal positioning that the embodiment of the present invention provides and the Serving Mobile Location Center of evolution, the Power Measurement Report first reported by E-SMLC mobile terminal receive, according to the described Power Measurement Report received, determines the base station participating in location; Secondly E-SMLC instruction participates in the base station transmission location reference signals of location, indicating mobile terminal carries out the measurement of propagation delay time for the location reference signals that the described base station participating in location sends, and the transmitting-receiving time difference of the serving base stations report mobile terminal of indicating mobile terminal and angle of arrival; The propagation delay time of described location reference signals that E-SMLC measures according to mobile terminal, the transmitting-receiving time difference of the serving base stations report of mobile terminal and angle of arrival, mobile terminal is positioned, can find out, E-SMLC is by the transmitting-receiving time difference of the serving base stations report of mobile terminal and angle of arrival, combine with the propagation delay time participating in the location reference signals of base station of locating and mobile terminal positioned, OTDOA location technology is optimized, thus the precision of location can be improved.In addition, because the base station participating in location can adjust the transmitting power of location reference signals, therefore, near-far interference can also be reduced.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (14)
1. a method for terminal positioning, is characterized in that, the method comprises:
The Power Measurement Report that the Serving Mobile Location Center E-SMLC mobile terminal receive of evolution reports, according to the described Power Measurement Report received, determines the base station participating in location;
The described base station participating in location of described E-SMLC instruction sends location reference signals, the location reference signals indicating described mobile terminal to send for the described base station participating in location carries out the measurement of propagation delay time, and the transmitting-receiving time difference of mobile terminal described in the serving base stations report indicating described mobile terminal and angle of arrival;
The transmitting-receiving time difference of the serving base stations report of the propagation delay time of the described location reference signals that described E-SMLC measures according to described mobile terminal, described mobile terminal and angle of arrival, position described mobile terminal.
2. the method for claim 1, is characterized in that, according to the described Power Measurement Report received, determines the base station participating in location, specifically comprises:
Respectively the mean value of Reference Signal Received Power of each adjacent base station and the first threshold of setting are compared, if the former is greater than the latter, then the adjacent base station of correspondence and the serving BS of described mobile terminal are defined as the base station participating in location.
3. the method for claim 1, it is characterized in that, described E-SMLC also comprises after indicating described mobile terminal to carry out the measurement of propagation delay time for the location reference signals that the described base station participating in location sends: indicate the described base station participating in location to stop sending location reference signals.
4. the method for claim 1, is characterized in that, described E-SMLC, according to the described Power Measurement Report received, after determining the base station participating in locating, also comprises:
If the Reference Signal Received Power participating in the base station of location is greater than the Second Threshold of setting, then the transmitting power of location reference signals reduces by the described described base station participating in location of E-SMLC instruction on the basis of default value; And/or
If the Reference Signal Received Power participating in the base station of location is less than the Second Threshold of setting, then the transmitting power of location reference signals improves by the described described base station participating in location of E-SMLC instruction on the basis of default value.
5. the method for claim 1, is characterized in that, described E-SMLC also comprises after indicating described mobile terminal to carry out the measurement of propagation delay time for the location reference signals that the described base station participating in location sends:
Difference operation is asked to the propagation delay time of the propagation delay time of base station and the serving BS of described mobile terminal that participate in location, obtains the transmission time delay difference of the base station participating in location;
Poor according to the propagation delay of the base station of described participation location, utilize hyperbola principle, determine at least two intersecting point coordinates;
Determine the abscissa of at least two intersecting point coordinates and the mean value of ordinate respectively, obtain the first coordinate of described mobile terminal.
6. method as claimed in claim 5, it is characterized in that, the transmitting-receiving time difference of the serving base stations report of the propagation delay time of the described location reference signals that described E-SMLC measures according to described mobile terminal, described mobile terminal and angle of arrival, described mobile terminal is positioned, specifically comprises:
According to transmitting-receiving time difference and the angle of arrival of the serving base stations report of described mobile terminal, determine the second coordinate of described mobile terminal;
According to described first coordinate and described second coordinate, described mobile terminal is positioned.
7. the method as described in any one of claim 1 ~ 6 claim, is characterized in that, before the Power Measurement Report that E-SMLC mobile terminal receive reports, also comprises:
Described mobile terminal initiates Location Request to mobile management entity MME, or the network side server of other location initiates Location Request to needing the MME of the mobile terminal of locating, or MME independently initiates Location Request.
8. a Serving Mobile Location Center E-SMLC for evolution, is characterized in that, comprising: receiver module, measurement module and locating module;
Described receiver module, for the Power Measurement Report that mobile terminal receive reports, according to the described Power Measurement Report received, determines the base station participating in location;
Described measurement module, be used to indicate the described base station participating in location and send location reference signals, the location reference signals indicating described mobile terminal to send for the described base station participating in location carries out the measurement of propagation delay time, and the transmitting-receiving time difference of mobile terminal described in the serving base stations report indicating described mobile terminal and angle of arrival;
Described locating module, for measure according to described mobile terminal the propagation delay time of described location reference signals, transmitting-receiving time difference of the serving base stations report of described mobile terminal and angle of arrival, described mobile terminal is positioned.
9. mobile location centre Chinese as claimed in claim 8, is characterized in that, described receiver module, specifically for:
Respectively the mean value of Reference Signal Received Power of each adjacent base station and the first threshold of setting are compared, if the former is greater than the latter, then the adjacent base station of correspondence and the serving BS of described mobile terminal are defined as the base station participating in location.
10. mobile location centre Chinese as claimed in claim 8, is characterized in that, described measurement module, also for:
After indicating described mobile terminal to carry out the measurement of propagation delay time for the location reference signals that the described base station participating in location sends, the described base station participating in location is indicated to stop sending location reference signals.
11. mobile location centre Chineses as claimed in claim 8, is characterized in that, described receiver module, also for:
If the Reference Signal Received Power participating in the base station of location is greater than the Second Threshold of setting, then the transmitting power of location reference signals reduces by the described described base station participating in location of E-SMLC instruction on the basis of default value; And/or
If the Reference Signal Received Power participating in the base station of location is less than the Second Threshold of setting, then the transmitting power of location reference signals improves by the described described base station participating in location of E-SMLC instruction on the basis of default value.
12. mobile location centre Chineses as claimed in claim 8, is characterized in that, described locating module, also for:
After indicating described mobile terminal to carry out the measurement of propagation delay time for the location reference signals that the described base station participating in location sends, difference operation is asked to the propagation delay time of the propagation delay time of base station and the serving BS of described mobile terminal that participate in location, obtains the transmission time delay difference of the base station participating in location;
Poor according to the propagation delay of the base station of described participation location, utilize hyperbola principle, determine at least two intersecting point coordinates;
Determine the abscissa of at least two intersecting point coordinates and the mean value of ordinate respectively, obtain the first coordinate of described mobile terminal.
13. mobile location centre Chineses as claimed in claim 12, is characterized in that, described locating module, specifically for:
According to transmitting-receiving time difference and the angle of arrival of the serving base stations report of described mobile terminal, determine the second coordinate of described mobile terminal;
According to described first coordinate and described second coordinate, described mobile terminal is positioned.
14. mobile location centre Chineses as described in any one of claim 8 ~ 13 claim, is characterized in that, described receiver module, also for:
Before the Power Measurement Report that mobile terminal receive reports, receive the Location Request that described mobile terminal is initiated to mobile management entity MME, or, receive the network side server of other location to the Location Request needing the MME of the mobile terminal of locating to initiate, or, receive the Location Request that MME independently initiates.
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