CN102984750A - Drive test method and system in GSM mobile network - Google Patents
Drive test method and system in GSM mobile network Download PDFInfo
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- CN102984750A CN102984750A CN2012105603720A CN201210560372A CN102984750A CN 102984750 A CN102984750 A CN 102984750A CN 2012105603720 A CN2012105603720 A CN 2012105603720A CN 201210560372 A CN201210560372 A CN 201210560372A CN 102984750 A CN102984750 A CN 102984750A
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Abstract
The invention discloses a drive test method and a system in a GSM (Global System for Mobile Communications) mobile network. The method comprises the steps that that at a drive test spot to be tested, a signal transmitted in a preset time window by a base station of a cell corresponding to the current frequency spot is received; then a drive test parameter of an FCCH (Frequency Correction Channel), a drive test parameter of an SCH (Synchronizing Channel) and a drive test parameter of a BCCH (Broadcast Control Channel) of the cell corresponding to the current frequency spot at the drive test spot to be tested are calculated; and the drive test parameters of the three physical channels are subjected to weighted summation operation so as to obtain a target drive test parameter. According to the drive test method and the system in the GSM mobile network, with the adoption of a mode of obtaining the drive test parameters corresponding to the three physical channels, the time and sampling spots for testing the drive test parameters are prolonged and increased, so that the target drive test parameter obtained according to the drive test parameters corresponding to the three physical channels is higher in accuracy.
Description
Technical field
The present invention relates to mobile communication technology, particularly relate to road measuring method and system among a kind of GSM mobile network.
Background technology
CHINAUNICOM and China Mobile are all at operation GSM network at present, the GSM network is with its stability and all standing, within a very long time in future, still to continue to carry main speech and SMS service, along with increasing, increase, the network capacity extension of access customer number build and the making rapid progress of urban construction, the coverage condition of GSM network is in the continuous variation, and existing network configuration will constantly be optimized and adjust.Compare wire communication and satellite communication, the wireless channel that the GSM network uses is the most complicated channel.In addition, the GSM network also relates at random access, the movement of a large number of users and switches in mobile communication process, so, need to carry out to it monitoring and the optimization of continuation.
Wireless channel monitoring to the GSM mobile network comprises drive test DT and call quality test CQT, generally the whole network of GSM or localized network are carried out DT, measure the base station sends under each residential quarter of its overlay area signal at received signal power RxLevel and the Carrier interference ratio CIR of position to be measured.Then the RxLevel that measures and CIR are submitted to network optimization software and analyze, obtain the coverage condition of whole net or localized network.Drive test is the basis of the GSM network optimization, in the process of the GSM network optimization, needs to measure by drive test more accurately RxLevel and the CIR of each residential quarter.Thereby the coverage information that reflects really described GSM network.
In the prior art, when implementing drive test, be to detect arbitrary physical channel among the broadcast channel BCH by sweep generator to obtain each residential quarter at the RxLevel of position to be measured and CIR.Described BCH comprises three physical channels: frequency correction channel FCCH, synchronous channel SCH and BCCH channel of broadcast control.The data that the base station issues by BCH under all residential quarters of a certain position are covered in sweep generator search, and the frequency that use each residential quarter is different, and sweep generator is distinguished different districts according to the frequency that searches.
Because the length of the training sequence in arbitrary physical channel that BCH comprises is less, be that sampled point is less, so the training sequence that adopts arbitrary physical channel to the residential quarter when the RxLevel of described position to be measured and CIR measure, the impact that RxLevel and the CIR of residential quarter in described position to be measured that measures by described physical channel is easy to be subject to random noise and interference, so that the result who measures is inaccurate, its measurement result can not reflect the residential quarter accurately in the communication performance of described position to be measured, thereby makes measurement result can accurately not reflect the coverage condition of whole GSM network.
Summary of the invention
The invention provides road measuring method and system among a kind of GSM mobile network, when obtaining the measurement parameter of certain residential quarter with the arbitrary physical channel in the solution available technology adopting BCH channel, because the sampling number of described arbitrary physical channel is few, and the impact that is subjected to easily random noise and interference causes the inaccurate technical problem of result measured, to improve the accuracy of drive test.
In order to solve the problems of the technologies described above, the invention provides road measuring method and system among a kind of GSM mobile network, the invention provides following technical scheme:
Road measuring method among a kind of GSM mobile network, the method comprises:
At drive test point to be measured, receive the signal that affiliated base station, residential quarter sends in the Preset Time window, described signal comprises frequency correction channel FCCH signal, synchronous channel SCH signal and BCCH channel of broadcast control signal at least;
Calculate the drive test parameter of current area corresponding FCCH on described drive test point to be measured according to the current training sequence in the described FCCH signal;
Calculate the drive test parameter of current area corresponding SCH on described drive test point to be measured according to the current training sequence in the described SCH signal;
Calculate the drive test parameter of current area corresponding BCCH on described drive test point to be measured according to the current training sequence in the described BCCH signal;
Obtain successively the drive test parameter of FCCH, the drive test parameter of SCH and target weight coefficient corresponding to drive test parameter of BCCH;
According to described target weight coefficient the drive test parameter of described FCCH, the drive test parameter of SCH, the drive test parameter of BCCH are weighted summation operation, to obtain described residential quarter in the target drive test parameter of described drive test point to be measured.
Preferably, described according to the current training sequence calculation plot in the described SCH signal before the drive test parameter of corresponding SCH on the described drive test point to be measured, also comprise:
Described SCH signal is decoded;
Decoded SCH signal is carried out cyclic check obtain the first check results;
Judge according to described the first check results whether decoded SCH signal correct, if, then with decoded SCH signal as the current training sequence in the SCH signal.
Preferably, describedly calculated current area before the drive test parameter of corresponding BCCH on the described drive test point to be measured according to the current training sequence in the described BCCH signal, also comprise:
Described BCCH signal is decoded;
Decoded BCCH signal is carried out cyclic check obtain the second check results;
Judge according to described the second check results whether decoded BCCH signal correct, if, then with decoded BCCH signal as the current training sequence among the BCCH.
Preferably, described drive test parameter according to the corresponding BCCH on described drive test point to be measured of the current training sequence calculation plot in the described BCCH signal specifically comprises:
According to the training sequence in each tdma frame among the BCCH, calculate successively drive test parameter corresponding to each tdma frame;
The drive test parameter that all tdma frames are corresponding among the BCCH is got and is averaging, to obtain the drive test parameter of BCCH.
Preferably, the described drive test parameter of FCCH, the drive test parameter of SCH and target weight coefficient corresponding to drive test parameter of BCCH of obtaining successively specifically comprises:
Obtain the total length of current training sequence, the current training sequence on the SCH and the current training sequence on the BCCH on the FCCH;
Calculate successively three first-phase division result that the total length of the length of the length of length, the current training sequence on the SCH of the current training sequence on the FCCH and the current training sequence on the BCCH and described current training sequence is divided by;
With the first-phase division result of described three channels as the target weight coefficient.
Preferably, the first-phase division result of described three channels as before the target weight coefficient, is also comprised:
Obtain the default reliability weight coefficient of FCCH, the default reliability weight coefficient of SCH and the default reliability weight coefficient of BCCH;
The default reliability weight coefficient of FCCH and the first-phase division result of FCCH are multiplied each other as the first-phase division result of FCCH;
The default reliability weight coefficient of SCH and the first-phase division result of SCH are multiplied each other as the first-phase division result of SCH;
The default reliability weight coefficient of BCCH and the first-phase division result of BCCH are multiplied each other as the first-phase division result of BCCH.
Preferably, describedly according to described target weight coefficient the drive test parameter of described FCCH, the drive test parameter of SCH, the drive test parameter of BCCH are weighted summation operation, to obtain described residential quarter in the target drive test parameter of described drive test point to be measured, specifically comprise:
According to described target weight coefficient the RxLevel of RxLevel, the SCH of described FCCH, the RxLevel of BCCH are weighted summation operation, to obtain target RxLevel;
According to described target weight coefficient the CIR of CIR, the SCH of described FCCH, the CIR of BCCH are weighted summation operation, to obtain target CIR;
With described target RxLevel and described target CIR as target drive test parameter.
The present invention also provides the driver test system among a kind of GSM mobile network, and described system comprises:
The first receiving element is used at drive test point to be measured, receives the signal that the affiliated base station of current area sends in the Preset Time window, and described signal comprises frequency correction channel FCCH signal, synchronous channel SCH signal and BCCH channel of broadcast control signal at least;
The first computing unit is used for the drive test parameter that current training sequence according to described FCCH signal calculates current area corresponding FCCH on described drive test point to be measured;
The second computing unit is used for the drive test parameter that current training sequence according to described SCH signal calculates current area corresponding SCH on described drive test point to be measured;
The 3rd computing unit is used for, and calculates the drive test parameter of current area corresponding BCCH on described drive test point to be measured according to the current training sequence in the described BCCH signal;
Acquiring unit is used for obtaining successively the drive test parameter of FCCH, the drive test parameter of SCH and target weight coefficient corresponding to drive test parameter of BCCH;
Arithmetic element is used for according to described target weight coefficient the drive test parameter of described FCCH, the drive test parameter of SCH, the drive test parameter of BCCH being weighted summation operation, to obtain current area in the target drive test parameter of described drive test point to be measured.
Preferably, described system also comprises:
The first decoding unit is used for according to the current training sequence calculation plot of described SCH signal before the drive test parameter of corresponding SCH on the described drive test point to be measured described SCH signal being decoded;
The first verification unit is used for that decoded SCH signal is carried out cyclic check and obtains the first check results;
The first judging unit is used for judging according to described the first check results whether decoded SCH signal correct, if, then with decoded SCH signal as the current training sequence in the SCH signal.
Preferably, described system also comprises:
The second decoding unit is used for current training sequence according to described BCCH signal and calculated current area before the drive test parameter of corresponding BCCH on the described drive test point to be measured, and described BCCH signal is decoded;
The second verification unit is used for that decoded BCCH signal is carried out cyclic check and obtains the second check results;
The second judging unit is used for judging according to described the second check results whether decoded BCCH signal correct, if, then with decoded BCCH signal as the current training sequence among the BCCH.
Preferably, described the 3rd computing unit specifically comprises:
The first computation subunit is used for the training sequence according to each tdma frame of BCCH, calculates successively drive test parameter corresponding to each tdma frame;
Average subelement is used for the drive test parameter that all tdma frames of BCCH are corresponding and gets and be averaging, to obtain the drive test parameter of BCCH.
Preferably, described acquiring unit specifically comprises:
The second computation subunit is for the total length that calculates current training sequence, the current training sequence on the SCH and the current training sequence on the BCCH on the FCCH;
The subelement that is divided by is used for calculating successively three first-phase division result that the total length of the length of the length of length, the current training sequence on the SCH of the current training sequence on the FCCH and the current training sequence on the BCCH and described current training sequence is divided by;
Determine subelement, be used for first-phase division result with described three channels as the target weight coefficient.
Preferably, described acquiring unit also comprises:
Obtain subelement, be used for obtaining the default reliability weight coefficient of FCCH, the default reliability weight coefficient of SCH and the default reliability weight coefficient of BCCH;
First-phase multiplier unit is used for the default reliability weight coefficient of FCCH and the first-phase division result of FCCH are multiplied each other as the first-phase division result of FCCH;
Second-phase multiplier unit is used for the default reliability weight coefficient of SCH and the first-phase division result of SCH are multiplied each other as the first-phase division result of SCH;
Third phase multiplier unit is used for the default reliability weight coefficient of BCCH and the first-phase division result of BCCH are multiplied each other as the first-phase division result of BCCH.
Preferably, described arithmetic element specifically comprises:
First object obtains subelement, is used for according to described target weight coefficient the RxLevel of RxLevel, the SCH of described FCCH, the RxLevel of BCCH being weighted summation operation, to obtain target RxLevel;
The second Target Acquisition subelement is used for according to described target weight coefficient the CIR of CIR, the SCH of described FCCH, the CIR of BCCH being weighted summation operation, to obtain target CIR;
The 3rd Target Acquisition subelement is used for described target RxLevel and described target CIR as target drive test parameter.
In the technical scheme of the present invention, obtain the drive test parameter of described FCCH, the drive test parameter of SCH and the drive test parameter of BCCH, be equivalent to increase time and the sampling number of measuring the drive test parameter, thereby so that the target drive test parameter of obtaining through weighted sum according to the drive test parameter of the drive test parameter of the drive test parameter of FCCH, SCH and BCCH has higher accuracy.And with prior art in only a physical channel is carried out drive test and compares, technical scheme of the present invention can comprehensively reflect each residential quarter at the covering performance of described drive test point to be measured, thereby obtains more accurately the coverage information of GSM network.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, the accompanying drawing that the following describes only is some embodiment that put down in writing among the application, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the flow chart of the road measuring method embodiment 1 among a kind of GSM mobile network of the present invention;
Fig. 2 is the flow chart of the road measuring method embodiment 2 among a kind of GSM mobile network of the present invention;
Fig. 3 is the structural representation of the driver test system embodiment 1 among a kind of GSM mobile network of the present invention;
Fig. 4 is the structural representation of the 3rd computing unit in the driver test system among a kind of GSM mobile network of the present invention;
Fig. 5 is the structural representation of acquiring unit in the driver test system among a kind of GSM mobile network of the present invention;
Fig. 6 is the structural representation of arithmetic element in the driver test system among a kind of GSM mobile network of the present invention;
Fig. 7 is the structural representation of the driver test system embodiment 2 among a kind of GSM mobile network of the present invention.
Embodiment
In order to make those skilled in the art person understand better the present invention program, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
With reference to shown in Figure 1, be the flow chart of the road measuring method embodiment 1 among a kind of GSM mobile network provided by the invention, present embodiment specifically can comprise:
Step 101: at drive test point to be measured, receive the signal that affiliated base station, residential quarter sends in the Preset Time window.
Shown in the reference table 1, for one of gsm system is controlled the signal that multi-frame comprises.
The signal that a control of table 1 gsm system multi-frame comprises
Described control multi-frame is made of 51 tdma frames.Wherein FB is the signal on the described FCCH, and SB is the signal on the SCH.As can be seen from Table 1, when sweep generator must sweep time, length be at least 11 tdma frames, just can guarantee to measure each residential quarter at RxLevel and the CIR of described drive test point to be measured with the training sequence among SCH or the FCCH.If use training sequence among the BCCH to measure each residential quarter at RxLevel and the CIR of described drive test point to be measured, then sweep generator must sweep time length be at least time of 61 tdma frames.Here sweep generator length sweep time is default time window.
In actual environment, for a certain position in the GSM network, might be covered by a plurality of residential quarters simultaneously, the received signal power of signal in described position that base station under described a plurality of residential quarter sends is different with carrier/interface ratio, measures each residential quarter by drive test and just can analyze the covering performance of whole GSM network in received signal power and the carrier/interface ratio of described position.The signal that described base station sends is when reality sends, and different tdma frames are to send in the different physical channels in BCH.As can be seen from Table 1, first tdma frame of controlling in the multi-frame sends in FCCH, and second tdma frame sends in SCH, and the 3rd the-the 6th tdma frame sends in BCCH.Because when carrying out drive test, in order to obtain each residential quarter at RxLevel and the CIR of described position, present embodiment uses is the signal that sends among the signal that sends among the signal that sends among the FCCH, the SCH and the BCCH, so to other data in the described control multi-frame, do not do too much introduction here.
Step 102: drive test parameter, the drive test parameter of SCH and the drive test parameter of BCCH of calculating FCCH.
The drive test parameter of the drive test parameter of described FCCH, the drive test parameter of SCH and BCCH includes RxLevel and CIR.In the described step 102 when calculating drive test parameter corresponding to three channels, the current training sequence in described three channels of use.In actual environment, when calculating the drive test parameter of the drive test parameter of drive test parameter, SCH of FCCH and BCCH, at first obtain the drive test parameter of FCCH, next obtains the drive test parameter of SCH, obtains at last that the drive test parameter of BCCH carries out.The below will be described in detail the acquisition process of drive test parameter corresponding to described three channels.
1), the drive test parameter of FCCH obtains
Shown in the reference table 2, be the signal that sends among the FCCH.
The signal that sends among table 2 FCCH
Wherein have the training sequence (FB) of 142 symbol lengths can be for drive test, the acquisition process of the drive test parameter of FCCH be specially: at first utilize Fourier transform to obtain in the fcch channel transmitted signal at the power spectrum P_R_FCCH=[fft of the reception signal of tested point (R_FCCH)] ^2.Obtain receiving after the power spectrum of signal, the approximate peak value with power spectrum adds that the calibration of power value of FCCH is as the power RXLevel_fcch that receives signal, described RXLevel_fcch=max (P_R_FCCH)+FCCH_P_CORR.All non-zero power values beyond the described spectrum peak are thought noise, and the power that then can obtain noise is P_N_FCCH=[sum (P_R_FCCH)-max (P_R_FCCH)]/N.Wherein, N is counting of Fourier transform.The last signal that just obtains the FCCH transmission is CIR_fcch=10*log10 (max (P_R_FCCH)/P_N_FCCH) at the CIR of tested point.
2), the drive test parameter of SCH obtains
Shown in the reference table 3, be the signal among the SCH.
Signal among table 3 SCH
Signal among the described SCH has 78 information symbols (BCH1 and BCH2) and 64 s' training sequence T_SEQ, and described T_SEQ is the current training sequence of SCH.The acquisition process of the drive test parameter of SCH is as follows:
Auto-correlation function xcorr(T_SEQ, the T_SEQ of described training sequence) can be similar to regard an impulse function as, corresponding peak value is designated as PR_T_SEQ.Described training sequence T_SEQ is through behind the channel, the signal that receives at receiving terminal as shown in Equation (1):
R_SEQ=T_SEQ*h+n formula (1)
Wherein h is the time domain impulse response of channel, and n is interchannel noise.If measure RxLevel and the CIR of residential quarter, then need to estimate time domain impulse response and the interchannel noise of channel.
The process of the time domain impulse response of estimation channel is as follows:
R_SEQ and T_SEQ are made cross-correlation calculation, obtain formula (2):
Xcorr (R_SEQ, T_SEQ)=xcorr (T_SEQ, T_SEQ) * h+xcorr (T_SEQ, n) formula (2)
Because training sequence T_SEQ and noise n are random sequence, so its correlation function can think 0, then first the expression-form on the equation of described formula (2) the right is as shown in Equation (3):
Xcorr (T_SEQ, T_SEQ) * h=PR_T_SEQ.h formula (3)
The expression formula of the channel time domain impulse response h_est that can be obtained estimating by described formula (2) and described formula (3) is h_est=xcorr (R_SEQ, T_SEQ)/PR_T_SEQ.
After the time domain channel shock response that obtains estimating, then can calculate training sequence T_SEQ and through the expression formula that arrives the signal of receiving terminal behind the channel be: RX_Signal=T_SEQ*h_est.
The expression formula of the noise of receiving terminal is Noise=R_SEQ-RX_Signal, and received signal power RXLevel and the carrier interference ratio C/I R that can obtain thus the residential quarter are respectively:
RXLevel=sum(R_SEQ^2)/N；
CIR=10*log10（RXLevel/sum(Noise^2)/N)。
3), the drive test parameter of BCCH obtains
Reference table 4 is the composition of the signal that sends by BCCH in the tdma frame.
The composition of the signal that sends by BCCH in tdma frame of table 4
What use when calculating the drive test parameter of BCCH is current training sequence among the BCCH, because the signal that BCCH sends takies 4 tdma frames, so will obtain according to the training sequence in each tdma frame a drive test parameter, 4 drive test parameters that will obtain at last are averaging rear drive test parameter as BCCH.The implementation of obtaining a drive test parameter according to the training sequence in each tdma frame can with reference to the obtain manner of the drive test parameter of SCH, repeat no more here.
Step 103: obtain successively the drive test parameter of FCCH, the drive test parameter of SCH and target weight coefficient corresponding to drive test parameter of BCCH.
Because the length of used current training sequence is different when the drive test parameter of the drive test parameter of calculating the drive test parameter of FCCH, SCH and BCCH, so the ratio of the length of total training sequence that can take according to the current training sequence in the different physical channels is determined described three time weight coefficients that physical channel drive test parameter is corresponding.Described time weight coefficient is described target weight coefficient.
Give an example, for described three physical channels, the total length of the training sequence that uses is L=142+64+26*4, and the time weight coefficient that then FCCH is corresponding is a1=142/L, the time weight coefficient that SCH is corresponding is a2=64/L, and the time weight coefficient that BCCH is corresponding is a1=26*4/L.
Step 104: according to described target weight coefficient the drive test parameter of described FCCH, the drive test parameter of SCH, the drive test parameter of BCCH are weighted summation operation, to obtain current area in the target drive test parameter of described drive test point to be measured.
The time weight coefficient calculations target drive test parameter that adopts the example in the described step 103 to calculate, the current area that obtains at last is respectively at the described RxLevel of drive test point and the CIR for the treatment of: RXLevel=RXLevel_fcch*142/L+RXLevel_sch*64/L+RXLevel_bcch * 26*4/L; CIR=CIR_fcch*142/L+CIR_sch*64/L+CIR_bcch*26*4/L.
In the technical scheme of present embodiment, obtain the drive test parameter of described FCCH, the drive test parameter of SCH and the drive test parameter of BCCH, be equivalent to increase time and the sampling number of measuring the drive test parameter, thereby so that the target drive test parameter of obtaining through weighted sum according to the drive test parameter of the drive test parameter of the drive test parameter of FCCH, SCH and BCCH has higher accuracy.And with prior art in only a physical channel is carried out drive test and compares, the technical scheme of present embodiment can comprehensively reflect each residential quarter at the covering performance of described drive test point to be measured, thereby obtains more accurately the coverage information of GSM network.
Although the technical scheme of described embodiment 1 can improve the accuracy of drive test parameter, the coverage information that more fully reflects the GSM network, but the length of the current training sequence among the current training sequence among the SCH and the BCCH is still less, this precision to the target drive test parameter obtained is influential, in order further to improve the precision of target drive test parameter, the invention provides the another kind of embodiment of the road measuring method among a kind of GSM mobile network, to improve the precision of target drive test parameter.
With reference to shown in Figure 2, be the flow chart of the road measuring method embodiment 2 among a kind of GSM mobile network provided by the invention, present embodiment specifically can comprise:
Step 201: at drive test point to be measured, receive the information that affiliated base station, residential quarter sends in the Preset Time window.
The implementation of described step 201 can with reference to the implementation of described step 101, repeat no more herein.
Step 202: the drive test parameter of calculating FCCH according to the current training sequence among the described FCCH.
The process of the drive test parameter of the described FCCH of obtaining can with reference to the implementation of the drive test parameter of obtaining FCCH in the described step 102, repeat no more herein.
Step 203: the signal to SCH is decoded, and upgrades current training sequence.
Before finding the solution the drive test parameter of SCH, first the information among the SCH is decoded, in the practical communication environment, training sequence all is known at transmitting terminal and receiving terminal, can be used for carrying out channel estimating, and data message is unknown at receiving terminal, need to decode.The purpose of here signal of SCH being decoded is to obtain 78 data message among the SCH by decoding, and with the data message that obtains and 64 training sequence among the SCH together as current training sequence, increase the length of training sequence.Because the mode that signal is decoded is a lot, do not limit concrete decoding process here.
Whether correct in order to verify the decoding of signal, preferred, can adopt the mode of cyclic check to verify, concrete, the algorithm of cyclic check can with reference to prior art, repeat no more here.
Step 204: the drive test parameter of calculating SCH according to the current training sequence that upgrades among the SCH.
The implementation of described step 204 can with reference to the implementation of the drive test parameter of obtaining SCH in the described step 102, repeat no more herein.
Step 205: the signal to BCCH is decoded, and upgrades current training sequence.
The implementation of described step 205 can be with reference to the implementation of described step 203, and different is after decoding, to need to upgrade the current training sequence in each tdma frame among the BCCH.
Step 206: the drive test parameter of obtaining BCCH.
The implementation of described step 206 can be with reference to the implementation of the drive test parameter of obtaining BCCH in the described step 102, different is in the described step 206 when calculating the drive test parameter of each tdma frame, use be current training sequence after upgrading in each tdma frame.
Step 207: the time weight coefficient that the drive test parameter of described three physical channels that obtain is corresponding;
The implementation of described step 207 can repeat no more with reference to the implementation of described step 103 herein.
Step 208: the reliability weight coefficient that the drive test parameter of described three physical channels that obtain is corresponding;
In practical communication, the equal power of the signal that the base station sends in described three physical channels under the described residential quarter is known, and the equal power of the signal in three physical channels equates.The reliability weight coefficient that the drive test parameter of described three physical channels is corresponding can obtain by a large amount of actual measurements and emulation.
Give an example, can in the laboratory, obtain by emulation during reliability weight coefficient corresponding to described three physical channels, also can obtain by actual measurement, describe in the laboratory, to be retrieved as example by emulation here.Acquisition process is as follows:
Because the equal power of transmitted signal and the transmitted signal equal power on each physical channel all is known, so can simulate described transmitted signal by signal generator in the laboratory, described signal is through the physical channel of simulation, arrive receiving terminal, receiving terminal is analyzed to received signal, obtains the received power of described signal on three physical channels.By repeating said process, just can obtain a sample of described signal corresponding different signal received powers constantly on three physical channels.Then, ask for the upper a plurality of received signal powers of SCH and transmitted signal in the variance of a plurality of received signal powers and the equal power of transmitted signal on SCH on the variance of the equal power on the SCH and BCCH of a plurality of received signal powers and transmitted signal on the variance of the equal power on the SCH, the FCCH.
Then, in next time test, the power that receives signal on each channel can be got the accuracy of each channel divided by the variance of correspondence, so the reliability weight coefficient of the corresponding physical channel result of being divided by for the accuracy sum of the accuracy of this channel and three physical channels.The reliability weight coefficient that obtains as known quantity, is done the weighted sum computing at receiving terminal with the power of the reception signal on described reliability weight coefficient and the corresponding physical channel, obtain the target received power of an estimation.
If the difference of the target received power that estimate this moment and the equal power of transmitting terminal signal is larger, the received signal power of three physical channels that then this obtained and before several times the received signal power of three physical channels obtaining of test together as a sample of signal received power, recomputate the reliability weight coefficient of each channel, estimate the target received power of current time, until the difference of the equal power of the target received power of estimating and transmitting terminal signal is in preset range the time, just the reliability weight coefficient of three physical channels obtaining can be carried out just can when actual drive test, having used.
Because the reflection of reliability weight coefficient is the accuracy of each channel measurement drive test parameter, in the present embodiment, if the accuracy of the drive test parameter that a certain physical channel is measured is not high, by the power of receiving end signal is done the weighted sum computing, can reduce its role in whole measurement result, so that the coverage condition that the target measurement parameter can more real reflection network.
Step 209: obtain the target weight coefficient.
Described target weight coefficient can be the reliability weight coefficient of the respective channels obtained in the described step 208, perhaps, be the product of the reliability weight coefficient of the respective channels obtained in the time weight coefficient of the respective channels obtained in the described step 207 and the described step 208.
Suppose that reliability weight coefficient corresponding to described three channels is respectively b_fcch, b_sch and b_bcch.
According to the example in described step 207 and the step 208, as can be known, target weight coefficient corresponding to described three physical channels is respectively: b_fcch*142/L, b_sch*142/L, b_bcch*142*4/L.
Step 210: calculate current area in the target drive test parameter of described drive test point to be measured.
Be with the target weight coefficient drive test parameter of described three physical channels to be weighted summation operation in this step, the described target drive test parameter of obtaining by described weighted sum computing is:
CIR=CIR_fcch*b_fcch*142/L+CIR_sch*b_sch*142/L+CIR_bcch*b_bcch*142*4/L；
RXLevel=RXLevel_fcch*b_fcch*142/L+RXLevel_sch*b_sch*142/L+RXLevel_bcch*b_bcch*142*4/L。
Present embodiment is except realizing the beneficial effect among the described embodiment 1, further, in the present embodiment the current training sequence among SCH and the BCCH is expanded, increased the sampling number in the physical channel, sampling number is more, and the drive test parameter that calculates is just more accurate.In addition, in the present embodiment drive test parameter of each physical channel has been carried out reliability weighted sum computing, reduced noise to target drive test effect of parameters, further improved the precision of target drive test parameter, made the covering performance that the drive test parameter that records can more real reflection network.
Accordingly, the present invention also provides the driver test system among a kind of GSM mobile network, is the structural representation of described system with reference to figure 3, and described system comprises:
Receiving element 301 is used at drive test point to be measured, receives the signal that the affiliated base station of current area sends in the Preset Time window, and described signal comprises frequency correction channel FCCH signal, synchronous channel SCH signal and BCCH channel of broadcast control signal at least;
The first computing unit 302 is used for the drive test parameter that current training sequence according to described FCCH signal calculates current area corresponding FCCH on described drive test point to be measured;
The second computing unit 303 is used for the drive test parameter that current training sequence according to described SCH signal calculates current area corresponding SCH on described drive test point to be measured;
The 3rd computing unit 304 is used for the drive test parameter that current training sequence according to described BCCH signal calculates current area corresponding BCCH on described drive test point to be measured;
Acquiring unit 305 is used for obtaining successively the drive test parameter of FCCH, the drive test parameter of SCH and target weight coefficient corresponding to drive test parameter of BCCH;
Preferably, with reference to shown in Figure 4, in the driver test system embodiment 1 among a kind of GSM mobile network provided by the invention, the structural representation of described the 3rd computing unit 304, described the 3rd computing unit 304 specifically comprises:
The first computation subunit 401 is used for the training sequence according to each tdma frame of BCCH, calculates successively drive test parameter corresponding to each tdma frame;
Preferably, with reference to shown in Figure 5, in the driver test system embodiment 1 among a kind of GSM mobile network provided by the invention, the structural representation of described acquiring unit 305, described acquiring unit 305 specifically comprises:
The second computation subunit 501 is for the total length that calculates current training sequence, the current training sequence on the SCH and the current training sequence on the BCCH on the FCCH;
The subelement 502 that is divided by is used for calculating successively three first-phase division result that the total length of the length of the length of length, the current training sequence on the SCH of the current training sequence on the FCCH and the current training sequence on the BCCH and described current training sequence is divided by;
Determine subelement 503, be used for first-phase division result with described three channels as the target weight coefficient.
Preferably, with reference to shown in Figure 6, in the driver test system embodiment 1 among a kind of GSM mobile network provided by the invention, the structural representation of described arithmetic element 306, described arithmetic element 306 specifically comprises:
First object obtains subelement 601, is used for according to described target weight coefficient the RxLevel of RxLevel, the SCH of described FCCH, the RxLevel of BCCH being weighted summation operation, to obtain target RxLevel;
The second Target Acquisition subelement 602 is used for according to described target weight coefficient the CIR of CIR, the SCH of described FCCH, the CIR of BCCH being weighted summation operation, to obtain target CIR;
The 3rd Target Acquisition subelement 603 is used for described target RxLevel and described target CIR as target drive test parameter.
Preferably, with reference to shown in Figure 7, be the structural representation of the driver test system embodiment 2 among a kind of GSM mobile network provided by the invention, except all unit shown in Figure 3, described system also comprises:
The first decoding unit 701 is used for according to the current training sequence calculation plot of described SCH signal before the drive test parameter of corresponding SCH on the described drive test point to be measured described SCH signal being decoded;
The first verification unit 702 is used for that decoded SCH signal is carried out cyclic check and obtains the first check results;
The first judging unit 703 is used for judging according to described the first check results whether decoded SCH signal correct, if, then with decoded SCH signal as the current training sequence in the SCH signal.
The second decoding unit 704 is used for according to the current training sequence calculation plot of described BCCH signal before the drive test parameter of corresponding BCCH on the described drive test point to be measured described BCCH signal being decoded;
The second verification unit 705 is used for that decoded BCCH signal is carried out cyclic check and obtains the second check results;
The second judging unit 706 is used for judging according to described the second check results whether decoded BCCH signal correct, if, then with decoded BCCH signal as the current training sequence among the BCCH;
Obtain subelement 707, be used for obtaining the default reliability weight coefficient of FCCH, the default reliability weight coefficient of SCH and the default reliability weight coefficient of BCCH;
First-phase multiplier unit 708 is used for the default reliability weight coefficient of FCCH and the first-phase division result of FCCH are multiplied each other as the first-phase division result of FCCH;
Second-phase multiplier unit 709 is used for the default reliability weight coefficient of SCH and the first-phase division result of SCH are multiplied each other as the first-phase division result of SCH;
Third phase multiplier unit 710 is used for the default reliability weight coefficient of BCCH and the first-phase division result of BCCH are multiplied each other as the first-phase division result of BCCH.
In the technical scheme of present embodiment, obtain the drive test parameter of described FCCH, the drive test parameter of SCH and the drive test parameter of BCCH, be equivalent to increase time and the sampling number of measuring the drive test parameter.Thereby so that the target drive test parameter of obtaining through weighted sum according to the drive test parameter of the drive test parameter of the drive test parameter of FCCH, SCH and BCCH has higher accuracy.And with prior art in only a physical channel is carried out drive test and compares, the technical scheme of present embodiment can comprehensively reflect each residential quarter at the covering performance of described drive test point to be measured, thereby obtains more accurately the coverage information of GSM network.
Further, in the present embodiment the current training sequence among SCH and the BCCH is expanded, further increased the sampling number in the physical channel, sampling number is more, and the drive test parameter that calculates is just more accurate.In addition, in the present embodiment drive test parameter of each physical channel has been carried out reliability weighted sum computing, reduced noise to target drive test effect of parameters, further improved the precision of target drive test parameter, made the covering performance that the drive test parameter that records can more real reflection network.
Need to prove, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby not only comprise those key elements so that comprise process, method, article or the equipment of a series of key elements, but also comprise other key elements of clearly not listing, or also be included as the intrinsic key element of this process, method, article or equipment.Do not having in the situation of more restrictions, the key element that is limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
For system embodiment, because it corresponds essentially to embodiment of the method, so relevant part gets final product referring to the part explanation of embodiment of the method.System embodiment described above only is schematic, wherein said unit as the separating component explanation can or can not be physically to separate also, the parts that show as the unit can be or can not be physical locations also, namely can be positioned at a place, perhaps also can be distributed on a plurality of network element.Can select according to the actual needs wherein some or all of module to realize the purpose of present embodiment scheme.Those of ordinary skills namely can understand and implement in the situation of not paying creative work.
The above only is the specific embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (14)
1. the road measuring method among the GSM mobile network is characterized in that, comprising:
At drive test point to be measured, receive the signal that affiliated base station, residential quarter sends in the Preset Time window, described signal comprises frequency correction channel FCCH signal, synchronous channel SCH signal and BCCH channel of broadcast control signal at least;
Calculate the drive test parameter of current area corresponding FCCH on described drive test point to be measured according to the current training sequence in the described FCCH signal;
Calculate the drive test parameter of current area corresponding SCH on described drive test point to be measured according to the current training sequence in the described SCH signal;
Calculate the drive test parameter of current area corresponding BCCH on described drive test point to be measured according to the current training sequence in the described BCCH signal;
Obtain successively the drive test parameter of FCCH, the drive test parameter of SCH and target weight coefficient corresponding to drive test parameter of BCCH;
According to described target weight coefficient the drive test parameter of described FCCH, the drive test parameter of SCH, the drive test parameter of BCCH are weighted summation operation, to obtain described residential quarter in the target drive test parameter of described drive test point to be measured.
2. method according to claim 1 is characterized in that, described according to the current training sequence calculation plot in the described SCH signal before the drive test parameter of corresponding SCH on the described drive test point to be measured, also comprise:
Described SCH signal is decoded;
Decoded SCH signal is carried out cyclic check obtain the first check results;
Judge according to described the first check results whether decoded SCH signal correct, if, then with decoded SCH signal as the current training sequence in the SCH signal.
3. method according to claim 1 is characterized in that, describedly calculates current area before the drive test parameter of corresponding BCCH on the described drive test point to be measured according to the current training sequence in the described BCCH signal, also comprises:
Described BCCH signal is decoded;
Decoded BCCH signal is carried out cyclic check obtain the second check results;
Judge according to described the second check results whether decoded BCCH signal correct, if, then with decoded BCCH signal as the current training sequence among the BCCH.
4. method according to claim 1 is characterized in that, described drive test parameter according to the corresponding BCCH on described drive test point to be measured of the current training sequence calculation plot in the described BCCH signal specifically comprises:
According to the training sequence in each tdma frame among the BCCH, calculate successively drive test parameter corresponding to each tdma frame;
The drive test parameter that all tdma frames are corresponding among the BCCH is got and is averaging, to obtain the drive test parameter of BCCH.
5. method according to claim 1 is characterized in that, the described drive test parameter of FCCH, the drive test parameter of SCH and target weight coefficient corresponding to drive test parameter of BCCH of obtaining successively specifically comprises:
Obtain the total length of current training sequence, the current training sequence on the SCH and the current training sequence on the BCCH on the FCCH;
Calculate successively three first-phase division result that the total length of the length of the length of length, the current training sequence on the SCH of the current training sequence on the FCCH and the current training sequence on the BCCH and described current training sequence is divided by;
With the first-phase division result of described three channels as the target weight coefficient.
6. method according to claim 5 is characterized in that, the first-phase division result of described three channels as before the target weight coefficient, is also comprised:
Obtain the default reliability weight coefficient of FCCH, the default reliability weight coefficient of SCH and the default reliability weight coefficient of BCCH;
The default reliability weight coefficient of FCCH and the first-phase division result of FCCH are multiplied each other as the first-phase division result of FCCH;
The default reliability weight coefficient of SCH and the first-phase division result of SCH are multiplied each other as the first-phase division result of SCH;
The default reliability weight coefficient of BCCH and the first-phase division result of BCCH are multiplied each other as the first-phase division result of BCCH.
7. method according to claim 1, it is characterized in that, describedly according to described target weight coefficient the drive test parameter of described FCCH, the drive test parameter of SCH, the drive test parameter of BCCH are weighted summation operation, to obtain described residential quarter in the target drive test parameter of described drive test point to be measured, specifically comprise:
According to described target weight coefficient the RxLevel of RxLevel, the SCH of described FCCH, the RxLevel of BCCH are weighted summation operation, to obtain target RxLevel;
According to described target weight coefficient the CIR of CIR, the SCH of described FCCH, the CIR of BCCH are weighted summation operation, to obtain target CIR;
With described target RxLevel and described target CIR as target drive test parameter.
8. the driver test system among the GSM mobile network is characterized in that described system comprises:
The first receiving element is used at drive test point to be measured, receives the signal that the affiliated base station of current area sends in the Preset Time window, and described signal comprises frequency correction channel FCCH signal, synchronous channel SCH signal and BCCH channel of broadcast control signal at least;
The first computing unit is used for the drive test parameter that current training sequence according to described FCCH signal calculates current area corresponding FCCH on described drive test point to be measured;
The second computing unit is used for the drive test parameter that current training sequence according to described SCH signal calculates current area corresponding SCH on described drive test point to be measured;
The 3rd computing unit is used for, and calculates the drive test parameter of current area corresponding BCCH on described drive test point to be measured according to the current training sequence in the described BCCH signal;
Acquiring unit is used for obtaining successively the drive test parameter of FCCH, the drive test parameter of SCH and target weight coefficient corresponding to drive test parameter of BCCH;
Arithmetic element is used for according to described target weight coefficient the drive test parameter of described FCCH, the drive test parameter of SCH, the drive test parameter of BCCH being weighted summation operation, to obtain current area in the target drive test parameter of described drive test point to be measured.
9. system according to claim 8 is characterized in that, described system also comprises:
The first decoding unit is used for according to the current training sequence calculation plot of described SCH signal before the drive test parameter of corresponding SCH on the described drive test point to be measured described SCH signal being decoded;
The first verification unit is used for that decoded SCH signal is carried out cyclic check and obtains the first check results;
The first judging unit is used for judging according to described the first check results whether decoded SCH signal correct, if, then with decoded SCH signal as the current training sequence in the SCH signal.
10. system according to claim 8 is characterized in that, described system also comprises:
The second decoding unit is used for current training sequence according to described BCCH signal and calculated current area before the drive test parameter of corresponding BCCH on the described drive test point to be measured, and described BCCH signal is decoded;
The second verification unit is used for that decoded BCCH signal is carried out cyclic check and obtains the second check results;
The second judging unit is used for judging according to described the second check results whether decoded BCCH signal correct, if, then with decoded BCCH signal as the current training sequence among the BCCH.
11. system according to claim 8 is characterized in that, described the 3rd computing unit specifically comprises:
The first computation subunit is used for the training sequence according to each tdma frame of BCCH, calculates successively drive test parameter corresponding to each tdma frame;
Average subelement is used for the drive test parameter that all tdma frames of BCCH are corresponding and gets and be averaging, to obtain the drive test parameter of BCCH.
12. system according to claim 8 is characterized in that, described acquiring unit specifically comprises:
The second computation subunit is for the total length that calculates current training sequence, the current training sequence on the SCH and the current training sequence on the BCCH on the FCCH;
The subelement that is divided by is used for calculating successively three first-phase division result that the total length of the length of the length of length, the current training sequence on the SCH of the current training sequence on the FCCH and the current training sequence on the BCCH and described current training sequence is divided by;
Determine subelement, be used for first-phase division result with described three channels as the target weight coefficient.
13. system according to claim 12 is characterized in that, described acquiring unit also comprises:
Obtain subelement, be used for obtaining the default reliability weight coefficient of FCCH, the default reliability weight coefficient of SCH and the default reliability weight coefficient of BCCH;
First-phase multiplier unit is used for the default reliability weight coefficient of FCCH and the first-phase division result of FCCH are multiplied each other as the first-phase division result of FCCH;
Second-phase multiplier unit is used for the default reliability weight coefficient of SCH and the first-phase division result of SCH are multiplied each other as the first-phase division result of SCH;
Third phase multiplier unit is used for the default reliability weight coefficient of BCCH and the first-phase division result of BCCH are multiplied each other as the first-phase division result of BCCH.
14. system according to claim 8 is characterized in that, described arithmetic element specifically comprises:
First object obtains subelement, is used for according to described target weight coefficient the RxLevel of RxLevel, the SCH of described FCCH, the RxLevel of BCCH being weighted summation operation, to obtain target RxLevel;
The second Target Acquisition subelement is used for according to described target weight coefficient the CIR of CIR, the SCH of described FCCH, the CIR of BCCH being weighted summation operation, to obtain target CIR;
The 3rd Target Acquisition subelement is used for described target RxLevel and described target CIR as target drive test parameter.
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| CN106645926B (en) * | 2016-12-29 | 2019-11-08 | 国网智能科技股份有限公司 | A kind of method of three-phase circuit power measuring and calculating |
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