CN100589624C - Method and apparatus for detecting antenna-feed installation problem - Google Patents

Method and apparatus for detecting antenna-feed installation problem Download PDF

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CN100589624C
CN100589624C CN200710099521A CN200710099521A CN100589624C CN 100589624 C CN100589624 C CN 100589624C CN 200710099521 A CN200710099521 A CN 200710099521A CN 200710099521 A CN200710099521 A CN 200710099521A CN 100589624 C CN100589624 C CN 100589624C
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district
sub
azimuth
noise ratio
antenna
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CN101137172A (en
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刘贤正
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ZTE Corp
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ZTE Corp
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Abstract

The invention provides a method of inspecting antenna feeder installation and apparatus therefor which is used for inspecting antenna feeder installation problems according to drive test data. The method comprises following steps: step A, according to each cell pilot frequency S/N in drive test data, the azimythal angle with maxium pilot frequency average S/N in each cell is obtained, and the azimythal angle is used as estimated value of the cell azimythal angle; step B, the antenna feeder installation problems are inspected according to the azimythal angle estimated value of each cell in abase station. The invention judges conditions of feeder installation sequence and transmission diversity of a plurality of cells connected to the same antenna without need of arriving under the base station or climbing to top of the antenna tower, reduces workload of engineering personnel.

Description

Check the method and the device of antenna-feed installation problem
Technical field
The present invention relates to the wireless communications application field, particularly a kind of method and device that is applied to check in code division multiple access (CDMA, the Code Division Multiple Access) system antenna-feed installation problem.
Background technology
In code division multiple access (CDMA, Code Division Multiple Access) system, the base station uses the PN sequence to modulate, and the PN sequence of the sub-district that same base station is different has different PN biasings.The PN biasing of PN sequence can be multiplexing, and for example, the PN sequence of identical PN biasing can be used in two sub-districts that distance is enough far away.For the same sub-district of multi-carrier frequency system, the PN of its different carrier frequency biasing is the same, at this moment can distinguish a contained fan altogether by frequency and PN bias junctions.In the process of drive test, each sub-district Active Set of the search that does not stop the test terminal, Candidate Set, the pilot channel that is comprised in Neighbor Set and the residual set is realized supervision and signal demodulation to the signal to noise ratio of each district pilots in the moving process according to the intensity of pilot signal in the above-mentioned pilot channel.
Use Ec/Io and Eb/Io to represent the signal to noise ratio of Code Channel on the forward channel.Wherein, Ec/Io represents the signal to noise ratio of pilot tone, and Eb/Io represents business, synchronously and the signal to noise ratio of paging channel.Pilot channel does not use the reason of Eb/Io to be, pilot channel does not carry any bit information, so represent the energy of pilot tone unit's chip with Ec, pilot chip speed is 1.2288Mcps, Io is defined as and receives total received power spectrum density within the bandwidth, comprises noise and the influence of other channel energy.
In real network, may there be installation question in the antenna feeder of base station, comprises the erection sequence mistake and the transmit diversity of a plurality of sub-districts is received the antenna of a sub-district first-class.Wherein, the erection sequence mistake is meant that the feeder line intersection is installed between the sub-district, be example for example, the feeder line of first sub-district is installed on the antenna of second sub-district, and described erection sequence mistake takes place when the feeder line of second sub-district being installed on the antenna of first sub-district with three cell base stations.Antenna-feed installation problem must cause the actual covering of network and network planning design inconsistent.Therefore, network optimization engineer needed to check whether antenna feeder exists installation question before carrying out network optimization work according to drive test data usually.
In the prior art, common being used to checks that the method for antenna-feed installation problem has 3 kinds, wherein, first kind be the engineer according to drive test data, subjective judgement is carried out in the covering of pilot tone.This method requires the engineer to have suitable rich practice experience, and this method can't accurately be judged the direction of pilot tone main lobe and the angle that differs.
The second method of prior art is: the engineer arrives the below, base station, utilizes the test terminal to check whether each district pilots order of this base station meets the sequence requirement of design, thereby judges whether to exist the erection sequence mistake.This method requirement engineer must arrive the below, base station and just can judge preferably, be very difficult and arrive some below, base station in the actual environment, and this method is difficult to judge the situation that is connected to same antenna such as two sub-district transmit diversities.
The third method is to check by root inspection according to the label of feeder line.This needs the specialized engineering personnel to climb to the antenna cat head to confirm one by one.Obviously, this method workload is big and be subjected to the influence of time and light.
By above-mentioned analysis as can be seen, the antenna feeder inspection method of prior art all has weak point separately, and needed workload is all very big, has increased the workload that antenna feeder is checked greatly.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method and device of checking antenna-feed installation problem, judges by the relevant information of preserving in drive test data and the base station information table whether the antenna feeder installation has problems.
For solving the problems of the technologies described above, it is as follows to the invention provides scheme:
A kind of method of checking antenna-feed installation problem is used for checking antenna-feed installation problem according to drive test data, may further comprise the steps:
Steps A according to the signal to noise ratio of each district pilots in the drive test data, is obtained the azimuth that has maximum pilot average signal to noise ratio in each sub-district, and with this azimuth as the azimuthal estimated value in this sub-district;
Step B checks antenna-feed installation problem according to the azimuthal estimated value in each sub-district, base station;
In the wherein said steps A, the described azimuth that has maximum pilot tone signal to noise ratio in the sub-district that obtains comprises:
The signal to noise ratio value of averaging of tested district pilots in the road test data in first sector region is calculated, and with the mean value that obtains as the pairing pilot average signal to noise ratio in azimuth, the described first fan-shaped central angle angular bisector place; The described first fan-shaped center of circle is position, a base station point, and radius r is less than or equal to the minimum multiplex distance of this tested sub-district PN sequence;
With the azimuth is transverse axis, the pilot average signal to noise ratio is the scatter diagram that the longitudinal axis obtains this tested district pilots average signal-to-noise ratio, and this scatter diagram carried out curve fitting, with the azimuth of the pairing azimuth of the wave crest point of matched curve as the maximum pilot average signal to noise ratio of having of this tested sub-district;
Wherein said step B comprises:
Step B1 according to azimuthal estimated value of each sub-district, judges whether each sub-district meets predefined logical order, if do not meet, then judges feeder line erection sequence mistake; Wherein, described predefined logical order is the PN sequence of the different pseudorandom PN biasings used according to predefined each sub-district and definite logical order.
Method of the present invention, wherein, in the described steps A, the azimuth, angular bisector place of the described first fan-shaped central angle comprises 0 °, 1 °, 2 ° ..., 359 °; The described first fan-shaped central angle is more than or equal to 2 ° and be less than or equal to 20 °.
Method of the present invention, wherein, in the described steps A, it is to carry out linear averaging to calculate that the described value of averaging is calculated.
Method of the present invention, wherein, in the described steps A, described curve fit is exponential curve match or sine curve match.
Method of the present invention among the described step B1, in the azimuthal estimated value according to each sub-district, is judged when each sub-district meets predefined logical order, enters step B2;
Step B2 according to the azimuthal estimated value in sub-district, obtains the angle between adjacent two sub-districts, and judge that whether the angle that is obtained is less than pre-set threshold, if judge that then emission Jian of these two sub-districts is contained on the same antenna, otherwise it is correct to judge that feeder line connects.
Method of the present invention, wherein, among the described step B2, described pre-set threshold is half of minimum angle between adjacent two sub-districts of writing down in the base station information table.
A kind of device of checking antenna-feed installation problem comprises:
Azimuth, sub-district acquisition module is used for the signal to noise ratio according to each district pilots of drive test data, obtains the azimuth that has maximum pilot average signal to noise ratio in each sub-district, and with this azimuth as the azimuthal estimated value in this sub-district;
Antenna-feed installation problem is checked module, and the azimuthal estimated value in each sub-district, base station that is used for obtaining according to azimuth, sub-district acquisition module is checked antenna-feed installation problem;
Wherein, azimuth, described sub-district acquisition module specifically comprises:
Pilot average signal to noise ratio acquisition module, the signal to noise ratio value of averaging that is used for the district pilots of road test data in first sector region is calculated, and with the mean value that the obtains pairing pilot average signal to noise ratio in azimuth, angular bisector place as the described first fan-shaped central angle; The described first fan-shaped center of circle is position, a base station point, and radius r is less than or equal to the minimum multiplex distance of this tested sub-district PN sequence;
The azimuth determination module is used for being transverse axis with the azimuth, and the pilot average signal to noise ratio is that the scatter diagram of the district pilots average signal-to-noise ratio of the longitudinal axis carries out curve fitting, and determines the azimuthal estimated value in this sub-district according to the pairing azimuth of the wave crest point of matched curve;
Wherein, described antenna-feed installation problem checks that module specifically comprises:
First judge module, be used for the azimuthal estimated value in each sub-district obtained according to azimuth, described sub-district acquisition module, judge whether each sub-district meets predefined logical order, and when not meeting described predefined logical order in each sub-district, judge feeder line erection sequence mistake; Wherein, described predefined logical order is the PN sequence of the different pseudorandom PN biasings used according to predefined each sub-district and definite logical order.
Device of the present invention, described antenna-feed installation problem checks that module also comprises: second judge module, when being used for meeting described predefined logical order in each sub-district, the azimuthal estimated value of obtaining according to azimuth, described sub-district acquisition module in each sub-district, obtain the angle between adjacent two sub-districts, and during less than pre-set threshold, judge that emission Jian of these two sub-districts is contained on the same antenna at the angle that is obtained.
From the above as can be seen, the method of inspection antenna-feed installation problem provided by the invention and device, signal to noise ratio based on district pilots in the drive test data, can obtain the azimuth, sub-district comparatively accurately, and can be connected to situations such as same antenna to feeder line erection sequence and a plurality of sub-districts transmit diversity and make judgement.The method of the invention need not the engineering staff and arrives base station below or climb to the antenna cat head, thereby reduced engineering staff's workload, has improved network optimization engineer's operating efficiency.
Description of drawings
Fig. 1 is the flow chart of the method for the described inspection antenna-feed installation problem of the embodiment of the invention;
Fig. 2 is the schematic diagram of first sector region in the embodiment of the invention;
Fig. 3 is a schematic diagram of checking the evaluation algorithm of antenna-feed installation problem in the embodiment of the invention;
Fig. 4 is the correct matched curve schematic diagram of feeder line erection sequence in the embodiment of the invention;
Fig. 5 is the matched curve schematic diagram of feeder line erection sequence mistake in the embodiment of the invention;
Fig. 6 is the matched curve schematic diagram of feeder line connection error in the embodiment of the invention;
Fig. 7 is the structural representation of the device of the described inspection antenna-feed installation problem of the embodiment of the invention.
Embodiment
The base station information table about self information is all being safeguarded in base station in the network, comprise in the base station information table and be the essential information of this base station configuration in advance, for example, the longitude and latitude of base station, included sub-district, the azimuth of each sub-district and the information such as PN biasing of each district pilots in base station.
On the azimuth, sub-district, this district pilots should have higher snr value, therefore, can analyze by the smnr data of this district pilots in the road test data, obtain the azimuth that has maximum pilot average signal to noise ratio in each sub-district, and with this azimuth as the azimuthal estimated value in this sub-district, and then check antenna-feed installation problem according to this estimated value.
Based on above-mentioned thought, the invention provides a kind of method of checking antenna-feed installation problem, the present invention is described in detail by specific embodiment below in conjunction with accompanying drawing.
Please refer to shown in Figure 1ly, the method for the described inspection antenna-feed installation problem of the embodiment of the invention may further comprise the steps:
Step 11, in the road test data in first sector region signal to noise ratio Ec/Io value of averaging of measured tested district pilots calculate, and with the mean value that obtains as the described first fan-shaped central angle angular bisector place azimuth angle theta pairing pilot average signal to noise ratio f (θ).
Here, the angle that will depart from the base station direct north clockwise is as azimuthal number of degrees usually, and promptly the azimuth of base station direct north is 0 °, and the azimuth of due east direction is 90 °, Due South to the azimuth be 180 °, positive west to the azimuth be 270 °.
Please refer to shown in Figure 2ly, here, the described first fan-shaped center of circle is position, a base station point, radius r is less than or equal to the minimum multiplex distance of this tested sub-district PN sequence, and azimuth, the first fan-shaped central angle angular bisector place is θ, and this first fan-shaped central angle is 2p, here, θ=0 °, 1 °, 2 °, ..., 359 °, p suggestion value is 1 °～10 °, therefore, this first fan-shaped central angle value is between 2 ° to 20 °.
In the step 11, described mean value calculation is to calculate linear average, suppose that n is the total number of sampling point of the signal to noise ratio of this tested district pilots of recording in described first sector region, ei is the signal to noise ratio Ec/Io of this tested district pilots of recording in described first sector region, wherein i=1,2, ..., n is because the unit of Ec/Io is dB, so
f ( θ ) = 10 log [ ( Σ i = 1 n 10 ei / 10 ) / n ] , θ=0 ° wherein, 1 °, 2 ° ..., 359 °
Step 12 is a transverse axis with θ, and f (θ) obtains the scatter diagram of this tested district pilots average signal-to-noise ratio for the longitudinal axis, and this scatter diagram is carried out curve fitting, with the pairing azimuth of the wave crest point of matched curve as this azimuth, tested sub-district estimated value.Here, can be according to exponential curve fitting, methods such as sine curve match carry out curve fitting to described scatter diagram.
Step 13 is obtained other azimuth, sub-district estimated values of this base station according to step 11 to 12 method.
Step 14 is checked antenna-feed installation problem according to the azimuthal estimated value in each sub-district, base station.
Here, please refer to shown in Figure 3ly, step 14 specifically may further comprise the steps:
Step 141 according to the azimuthal estimated value in each sub-district, judges whether each sub-district meets predefined logical order, if do not meet, then judges feeder line erection sequence mistake, otherwise enters step 142;
Here, in the step 141, described predefined logical order information comes from the base station information table.For example, be example with 3 cell base stations, the PN sequence of different PN biasings is used in each sub-district.The PN biasing of supposing to record in the base station information table first to the 3rd sub-district is respectively 4,8 and 12; And be transverse axis with θ, resultant the azimuthal estimated value S1 in each sub-district～S3 as shown in Figure 4 for the longitudinal axis carries out curve fitting to 3 sub-districts, this base station for f (θ), wherein, S1 is biased to 4 first sub-district corresponding to PN, S2 is biased to 8 second sub-district corresponding to PN, and S3 is biased to 12 the 3rd sub-district corresponding to PN.Under the correct situation of feeder line erection sequence, azimuth, first to the 3rd sub-district meets clockwise order, promptly can only be these 3 kinds of orders of S1-S2-S3, S2-S3-S1 or S3-S1-S2 on the θ transverse axis.The order of 3 azimuthal estimated values in sub-district is S2-S3-S1 among Fig. 4, therefore for Fig. 4, can judge that the feeder line erection sequence of each sub-district is correct.If as shown in Figure 5, the order of 3 azimuthal estimated values in sub-district is S1-S3-S2, at this moment will judge feeder line erection sequence mistake.
Step 142 according to the azimuthal estimated value in sub-district, is obtained the angle between adjacent two sub-districts, and whether judge this angle less than pre-set threshold α, if judge that then emission Jian of two sub-districts is contained on the same antenna, otherwise it is correct to judge that feeder line connects.
Here, adjacent two azimuthal estimated values in sub-district are subtracted each other resulting absolute value as the angle between adjacent two sub-districts.Described pre-set threshold α is an empirical value, the azimuth and the network planning of considering antenna in the actual engineering have certain error, also there are certain error in drive test data and curve fit, and usually α gets half of minimum angle between two neighbor cells that write down in the base station information table.Still be example with above-mentioned 3 cell base stations, Figure 6 shows that curve-fitting results to 3 district pilots average signal-to-noise ratios, sub-district feeder line erection sequence S3-S1-S2 is correct among Fig. 6, but there is the angle between the neighbor cell | S1-S2|＜α (suppose α=60 °) is contained in the situation on the same antenna so judge the emission Jian that has two sub-districts this moment.
Based on the method for above-mentioned inspection antenna-feed installation problem, the present invention also provides a kind of device of checking antenna-feed installation problem, and as shown in Figure 7, this device 70 comprises:
Azimuth, sub-district acquisition module 71 is used for the signal to noise ratio according to each district pilots of drive test data, obtains the azimuth that has maximum pilot average signal to noise ratio in each sub-district, and with this azimuth as the azimuthal estimated value in this sub-district.
Antenna-feed installation problem is checked module 72, and the azimuthal estimated value in each sub-district, base station that is used for obtaining according to azimuth, sub-district acquisition module 71 is checked antenna-feed installation problem.
Wherein, azimuth, described sub-district acquisition module 71 specifically comprises:
Pilot average signal to noise ratio acquisition module 711, the signal to noise ratio value of averaging that is used for the district pilots of road test data in first sector region is calculated, and with the mean value that the obtains pairing pilot average signal to noise ratio in azimuth, angular bisector place as the described first fan-shaped central angle; The described first fan-shaped center of circle is position, a base station point, and radius r is less than or equal to the minimum multiplex distance of this tested sub-district PN sequence.
Azimuth determination module 712, be used for the pilot average signal to noise ratio obtained according to pilot average signal to noise ratio acquisition module 711, to being transverse axis with the azimuth, the pilot average signal to noise ratio is that the scatter diagram of the district pilots average signal-to-noise ratio of the longitudinal axis carries out curve fitting, and determines the azimuthal estimated value in this sub-district according to the pairing azimuth of the wave crest point of matched curve.
Wherein, described antenna-feed installation problem checks that module 72 specifically comprises:
First judge module 721, be used for the azimuthal estimated value in each sub-district obtained according to azimuth, described sub-district acquisition module 71, judge whether each sub-district meets predefined logical order, and when not meeting described predefined logical order in each sub-district, judge feeder line erection sequence mistake;
Second judge module 722, when being used for meeting described predefined logical order in each sub-district, the azimuthal estimated value of obtaining according to azimuth, described sub-district acquisition module 71 in each sub-district, obtain the angle between adjacent two sub-districts, and during less than pre-set threshold, judge that emission Jian of these two sub-districts is contained on the same antenna at the angle that is obtained.
In sum, the method and the device of the described inspection antenna-feed installation problem of the embodiment of the invention, signal to noise ratio based on district pilots in the drive test data, the scatter diagram of being made up of the average signal-to-noise ratio and the azimuth of district pilots is carried out curve fitting, obtain the azimuthal estimated value in sub-district, thereby judge according to this estimated value whether the antenna feeder installation of base station has problems.
The method of inspection antenna-feed installation problem of the present invention and device, be not restricted to listed utilization in specification and the execution mode, it can be applied to various suitable the present invention's field fully, for those skilled in the art, can easily realize additional advantage and make amendment, therefore under the situation of the spirit and scope of the universal that does not deviate from claim and equivalency range and limited, the examples shown that the present invention is not limited to specific details, representational equipment and illustrates here and describe.

Claims (8)

1. a method of checking antenna-feed installation problem is used for checking antenna-feed installation problem according to drive test data, it is characterized in that may further comprise the steps:
Steps A according to the signal to noise ratio of each district pilots in the drive test data, is obtained the azimuth that has maximum pilot average signal to noise ratio in each sub-district, and with this azimuth as the azimuthal estimated value in this sub-district;
Step B checks antenna-feed installation problem according to the azimuthal estimated value in each sub-district, base station;
In the wherein said steps A, the described azimuth that has maximum pilot tone signal to noise ratio in the sub-district that obtains comprises:
The signal to noise ratio value of averaging of tested district pilots in the road test data in first sector region is calculated, and with the mean value that obtains as the pairing pilot average signal to noise ratio in azimuth, the described first fan-shaped central angle angular bisector place; The described first fan-shaped center of circle is position, a base station point, and radius r is less than or equal to the minimum multiplex distance of this tested sub-district PN sequence;
With the azimuth is transverse axis, the pilot average signal to noise ratio is the scatter diagram that the longitudinal axis obtains this tested district pilots average signal-to-noise ratio, and this scatter diagram carried out curve fitting, with the azimuth of the pairing azimuth of the wave crest point of matched curve as the maximum pilot average signal to noise ratio of having of this tested sub-district;
Wherein said step B comprises:
Step B1 according to azimuthal estimated value of each sub-district, judges whether each sub-district meets predefined logical order, if do not meet, then judges feeder line erection sequence mistake; Wherein, described predefined logical order is the PN sequence of the different pseudorandom PN biasings used according to predefined each sub-district and definite logical order.
2. the method for claim 1 is characterized in that, in the described steps A, the azimuth, angular bisector place of the described first fan-shaped central angle comprises 0 °, 1 °, and 2 ° ..., 359 °; The described first fan-shaped central angle is more than or equal to 2 ° and be less than or equal to 20 °.
3. the method for claim 1 is characterized in that, in the described steps A, it is to carry out linear averaging to calculate that the described value of averaging is calculated.
4. the method for claim 1 is characterized in that, in the described steps A, described curve fit is exponential curve match or sine curve match.
5. the method for claim 1 is characterized in that, among the described step B1, in the azimuthal estimated value according to each sub-district, judges when each sub-district meets predefined logical order, enters step B2;
Step B2 according to the azimuthal estimated value in sub-district, obtains the angle between adjacent two sub-districts, and judge that whether the angle that is obtained is less than pre-set threshold, if judge that then emission Jian of these two sub-districts is contained on the same antenna, otherwise it is correct to judge that feeder line connects.
6. method as claimed in claim 5 is characterized in that, among the described step B2, described pre-set threshold is half of minimum angle between adjacent two sub-districts of writing down in the base station information table.
7. device of checking antenna-feed installation problem is characterized in that comprising:
Azimuth, sub-district acquisition module is used for the signal to noise ratio according to each district pilots of drive test data, obtains the azimuth that has maximum pilot average signal to noise ratio in each sub-district, and with this azimuth as the azimuthal estimated value in this sub-district;
Antenna-feed installation problem is checked module, and the azimuthal estimated value in each sub-district, base station that is used for obtaining according to azimuth, sub-district acquisition module is checked antenna-feed installation problem;
Wherein, azimuth, described sub-district acquisition module specifically comprises:
Pilot average signal to noise ratio acquisition module, the signal to noise ratio value of averaging that is used for the district pilots of road test data in first sector region is calculated, and with the mean value that the obtains pairing pilot average signal to noise ratio in azimuth, angular bisector place as the described first fan-shaped central angle; The described first fan-shaped center of circle is position, a base station point, and radius r is less than or equal to the minimum multiplex distance of this tested sub-district PN sequence;
The azimuth determination module is used for being transverse axis with the azimuth, and the pilot average signal to noise ratio is that the scatter diagram of the district pilots average signal-to-noise ratio of the longitudinal axis carries out curve fitting, and determines the azimuthal estimated value in this sub-district according to the pairing azimuth of the wave crest point of matched curve;
Wherein said antenna-feed installation problem checks that module comprises:
First judge module, be used for the azimuthal estimated value in each sub-district obtained according to azimuth, described sub-district acquisition module, judge whether each sub-district meets predefined logical order, and when not meeting described predefined logical order in each sub-district, judge feeder line erection sequence mistake; Wherein, described predefined logical order is the PN sequence of the different pseudorandom PN biasings used according to predefined each sub-district and definite logical order.
9. device as claimed in claim 7 is characterized in that, described antenna-feed installation problem checks that module also comprises:
Second judge module, when being used for meeting described predefined logical order in each sub-district, the azimuthal estimated value of obtaining according to azimuth, described sub-district acquisition module in each sub-district, obtain the angle between adjacent two sub-districts, and during less than pre-set threshold, judge that emission Jian of these two sub-districts is contained on the same antenna at the angle that is obtained.
CN200710099521A 2007-05-23 2007-05-23 Method and apparatus for detecting antenna-feed installation problem Expired - Fee Related CN100589624C (en)

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CN102440023B (en) * 2011-10-31 2014-01-08 华为技术有限公司 Detection method and device of antenna feeder cross

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