CN102984750B - Road measuring method in a kind of GSM mobile network and system - Google Patents
Road measuring method in a kind of GSM mobile network and system Download PDFInfo
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Abstract
The invention discloses the road measuring method in a kind of GSM mobile network and system, described method comprises: at drive test to be measured point, the signal that the base station receiving current frequency respective cell sends in Preset Time window, then calculates the drive test parameter of current frequency respective cell at the drive test parameter of FCCH of described drive test point to be measured, the drive test parameter of SCH and BCCH; Summation operation is weighted to the drive test parameter of described three physical channels, to obtain target drive test parameter.In the present invention, adopt the mode obtaining drive test parameter corresponding to described three physical channels, add the time and sampling number of measuring drive test parameter, thus make according to drive test parameter acquiring corresponding to described three physical channels to target drive test parameter there is higher accuracy.
Description
Technical field
The present invention relates to mobile communication technology, particularly relate to the road measuring method in a kind of GSM mobile network and system.
Background technology
Current CHINAUNICOM and China Mobile are all in operation GSM network, GSM network is with its stability and all standing, the main speech of carrying and SMS service still will be continued within a very long time in future, build and the making rapid progress of urban construction along with the increase of access customer number, the network capacity extension increase, the coverage condition of GSM network is in constantly change, and existing network configuration will constantly be optimized and adjust.Compare wire communication and satellite communication, the wireless channel that GSM network uses is the most complicated channel.In addition, GSM network also relates to Stochastic accessing, the movement of a large number of users and switches in mobile communication process, so, need monitoring and the optimization of it being carried out to continuation.
Drive test DT and call quality test CQT is comprised to the wireless channel monitoring of GSM mobile network, generally DT is carried out to the whole network of GSM or localized network, the received signal power RxLevel of the signal that each community own base station measuring its overlay area sends in position to be measured and Carrier interference ratio CIR.Then RxLevel and CIR of measurement is submitted to network optimization software to analyze, obtain the coverage condition of whole net or localized network.Drive test is the basis that GSM network is optimized, and in the process that GSM network is optimized, needs RxLevel and CIR being measured each community more accurately by drive test.Thus the coverage information of the described GSM network of real reflection.
In the prior art, when implementing drive test, be that the arbitrary physical channel detected in broadcast channel BCH by sweep generator obtains RxLevel and CIR of each community in position to be measured.Described BCH comprises three physical channels: frequency correction channel FCCH, synchronous channel SCH and BCCH channel of broadcast control.The data that all communities own base station that sweep generator search covers a certain position is issued by BCH, the frequency that each community uses is different, and sweep generator distinguishes different districts according to the frequency searched.
Because the length of the training sequence in arbitrary physical channel that BCH comprises is less, namely sampled point is less, so when adopting the training sequence of arbitrary physical channel to measure at RxLevel and CIR of described position to be measured community, the community measured by described physical channel is easy at RxLevel and CIR of described position to be measured the impact being subject to random noise and interference, make the result of measurement inaccurate, its measurement result can not reflect the communication performance of community in described position to be measured accurately, thus make measurement result can accurately not reflect the coverage condition of whole GSM network.
Summary of the invention
The invention provides the road measuring method in a kind of GSM mobile network and system, when adopting the arbitrary physical channel in BCH channel to obtain the measurement parameter of certain community to solve in prior art, because the sampling number of described arbitrary physical channel is few, and easily cause the inaccurate technical problem of result of measurement by the impact of random noise and interference, to improve the accuracy of drive test.
In order to solve the problems of the technologies described above, the invention provides the road measuring method in a kind of GSM mobile network and system, the invention provides following technical scheme:
A road measuring method in GSM mobile network, the method comprises:
At drive test to be measured point, receive the signal that community own base station sends in Preset Time window, described signal at least comprises frequency correction channel FCCH signal, synchronous channel SCH signal and BCCH channel of broadcast control signal;
The drive test parameter of current area corresponding FCCH on described drive test to be measured point is calculated according to the current training sequence in described FCCH signal;
The drive test parameter of current area corresponding SCH on described drive test to be measured point is calculated according to the current training sequence in described SCH signal;
The drive test parameter of current area corresponding BCCH on described drive test to be measured point is calculated according to the current training sequence in described BCCH signal;
Obtain the target weight coefficient that the drive test parameter of the drive test parameter of FCCH, the drive test parameter of SCH and BCCH is corresponding successively;
According to described target weight coefficient, summation operation is weighted, to obtain the target drive test parameter of described community at described drive test to be measured point to the drive test parameter of described FCCH, the drive test parameter of SCH, the drive test parameter of BCCH.
Preferably, before the described drive test parameter according to the corresponding SCH on described drive test to be measured point of the current training sequence calculation plot in described SCH signal, also comprise:
Described SCH signal is decoded;
Cyclic check is carried out to decoded SCH signal and obtains the first check results;
Judge that decoded SCH signal is whether correct according to described first check results, if so, then using decoded SCH signal as the current training sequence in SCH signal.
Preferably, before the described drive test parameter according to the current training sequence calculating current area corresponding BCCH on described drive test to be measured point in described BCCH signal, also comprise:
Described BCCH signal is decoded;
Cyclic check is carried out to decoded BCCH signal and obtains the second check results;
Judge that decoded BCCH signal is whether correct according to described second check results, if so, then using decoded BCCH signal as the current training sequence in BCCH.
Preferably, the described drive test parameter according to the corresponding BCCH on described drive test to be measured point of the current training sequence calculation plot in described BCCH signal, specifically comprises:
According to the training sequence in tdma frame each in BCCH, calculate the drive test parameter that each tdma frame is corresponding successively;
Drive test parameter corresponding for tdma frames all in BCCH is got and is averaging, to obtain the drive test parameter of BCCH.
Preferably, the target weight coefficient that the described drive test parameter obtaining the drive test parameter of FCCH, the drive test parameter of SCH and BCCH is successively corresponding, specifically comprises:
Obtain the total length of current training sequence, the current training sequence on SCH and the current training sequence on BCCH on FCCH;
Calculate three first-phase division result that the length of current training sequence on the length of the current training sequence on the length of the current training sequence on FCCH, SCH and BCCH and the total length of described current training sequence are divided by successively;
Using the first-phase division result of described three channels as target weight coefficient.
Preferably, using the first-phase division result of described three channels as before target weight coefficient, also comprise:
Obtain the default reliability weight coefficient of the default reliability weight coefficient of FCCH, the default reliability weight coefficient of SCH and BCCH;
The default reliability weight coefficient of FCCH is multiplied as the first-phase division result of FCCH with the first-phase division result of FCCH;
The default reliability weight coefficient of SCH is multiplied as the first-phase division result of SCH with the first-phase division result of SCH;
The default reliability weight coefficient of BCCH is multiplied as the first-phase division result of BCCH with the first-phase division result of BCCH.
Preferably, describedly according to described target weight coefficient, summation operation is weighted to the drive test parameter of described FCCH, the drive test parameter of SCH, the drive test parameter of BCCH, to obtain the target drive test parameter of described community at described drive test to be measured point, specifically comprises:
Summation operation is weighted, to obtain target RxLevel according to the RxLevel of described target weight coefficient to RxLevel, BCCH of RxLevel, SCH of described FCCH;
Summation operation is weighted, to obtain target CIR according to the CIR of described target weight coefficient to CIR, BCCH of CIR, SCH of described FCCH;
Using described target RxLevel and described target CIR as target drive test parameter.
The present invention also provides the driver test system in a kind of GSM mobile network, and described system comprises:
First receiving element, at drive test to be measured point, receive the signal that current area own base station sends in Preset Time window, described signal at least comprises frequency correction channel FCCH signal, synchronous channel SCH signal and BCCH channel of broadcast control signal;
First computing unit, for calculating the drive test parameter of current area corresponding FCCH on described drive test to be measured point according to the current training sequence in described FCCH signal;
Second computing unit, for calculating the drive test parameter of current area corresponding SCH on described drive test to be measured point according to the current training sequence in described SCH signal;
3rd computing unit, for, the drive test parameter of current area corresponding BCCH on described drive test to be measured point is calculated according to the current training sequence in described BCCH signal;
Acquiring unit, the target weight coefficient that the drive test parameter for obtaining the drive test parameter of FCCH, the drive test parameter of SCH and BCCH is successively corresponding;
Arithmetic element, for being weighted summation operation, to obtain the target drive test parameter of current area at described drive test to be measured point according to described target weight coefficient to the drive test parameter of described FCCH, the drive test parameter of SCH, the drive test parameter of BCCH.
Preferably, described system also comprises:
First decoding unit, for according to before the drive test parameter of the corresponding SCH on described drive test to be measured point of the current training sequence calculation plot in described SCH signal, decodes to described SCH signal;
First verification unit, obtains the first check results for carrying out cyclic check to decoded SCH signal;
First judging unit, for judging that according to described first check results decoded SCH signal is whether correct, if so, then using decoded SCH signal as the current training sequence in SCH signal.
Preferably, described system also comprises:
Second decoding unit, before calculating the drive test parameter of current area corresponding BCCH on described drive test to be measured point according to the current training sequence in described BCCH signal, decodes to described BCCH signal;
Second verification unit, obtains the second check results for carrying out cyclic check to decoded BCCH signal;
Second judging unit, for judging that according to described second check results decoded BCCH signal is whether correct, if so, then using decoded BCCH signal as the current training sequence in BCCH.
Preferably, described 3rd computing unit specifically comprises:
First computation subunit, for according to the training sequence in each tdma frame of BCCH, calculates the drive test parameter that each tdma frame is corresponding successively;
Average subelement, for drive test parameter corresponding for tdma frames all in BCCH is got and is averaging, to obtain the drive test parameter of BCCH.
Preferably, described acquiring unit specifically comprises:
Second computation subunit, for calculating the total length of the current training sequence on the current training sequence on FCCH, the current training sequence on SCH and BCCH;
Be divided by subelement, three first-phase division result that the length of current training sequence in the length that calculates the current training sequence on the length of the current training sequence on FCCH, SCH successively and BCCH and the total length of described current training sequence are divided by;
Determine subelement, for using the first-phase division result of described three channels as target weight coefficient.
Preferably, described acquiring unit also comprises:
Obtain subelement, for obtaining the default reliability weight coefficient of the default reliability weight coefficient of FCCH, the default reliability weight coefficient of SCH and BCCH;
First-phase multiplier unit, for being multiplied as the first-phase division result of FCCH using the default reliability weight coefficient of FCCH with the first-phase division result of FCCH;
Second-phase multiplier unit, for being multiplied as the first-phase division result of SCH using the default reliability weight coefficient of SCH with the first-phase division result of SCH;
Third phase multiplier unit, for being multiplied the default reliability weight coefficient of BCCH as the first-phase division result of BCCH with the first-phase division result of BCCH.
Preferably, described arithmetic element specifically comprises:
First object obtains subelement, for being weighted summation operation, to obtain target RxLevel according to the RxLevel of described target weight coefficient to RxLevel, BCCH of RxLevel, SCH of described FCCH;
Second Target Acquisition subelement, for being weighted summation operation, to obtain target CIR according to the CIR of described target weight coefficient to CIR, BCCH of CIR, SCH of described FCCH;
3rd Target Acquisition subelement, for using described target RxLevel and described target CIR as target drive test parameter.
In technical scheme of the present invention, obtain the drive test parameter of the drive test parameter of described FCCH, the drive test parameter of SCH and BCCH, be equivalent to the time and the sampling number that add measurement drive test parameter, thus make the target drive test parameter obtained through weighted sum according to the drive test parameter of the drive test parameter of FCCH, the drive test parameter of SCH and BCCH have higher accuracy.And only carry out compared with drive test to a physical channel with prior art, technical scheme of the present invention comprehensively can reflect the covering performance of each community at described drive test point to be measured, thus obtains the coverage information of GSM network more accurately.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, 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.
Fig. 1 is the flow chart of the road measuring method embodiment 1 in a kind of GSM mobile network of the present invention;
Fig. 2 is the flow chart of the road measuring method embodiment 2 in a kind of GSM mobile network of the present invention;
Fig. 3 is the structural representation of the driver test system embodiment 1 in 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 in a kind of GSM mobile network of the present invention;
Fig. 5 is the structural representation of acquiring unit in the driver test system in a kind of GSM mobile network of the present invention;
Fig. 6 is the structural representation of arithmetic element in the driver test system in a kind of GSM mobile network of the present invention;
Fig. 7 is the structural representation of the driver test system embodiment 2 in a kind of GSM mobile network of the present invention.
Embodiment
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Shown in figure 1, be the flow chart of the road measuring method embodiment 1 in a kind of GSM mobile network provided by the invention, the present embodiment specifically can comprise:
Step 101: at drive test to be measured point, receives the signal that community own base station sends in Preset Time window.
Shown in reference table 1, it is the signal that gsm system one control multi-frame comprises.
Table 1GSM system signal controlling multi-frame and comprise
Described control multi-frame is made up of 51 tdma frames.Wherein FB is the signal on described FCCH, and SB is the signal on SCH.As can be seen from Table 1, sweep generator must when sweep time, length be at least 11 tdma frames, just can guarantee to use training sequence in SCH or FCCH to measure RxLevel and CIR of each community at described drive test to be measured point.If use the training sequence in BCCH to measure RxLevel and CIR of each community at described drive test to be measured point, 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 GSM network, likely simultaneously by multiple MPS process, the received signal power of the signal that base station belonging to described multiple community sends in described position and carrier/interface ratio are different, measure the received signal power of each community in described position and carrier/interface ratio just can analyze the covering performance of whole GSM network by drive test.The signal that described base station sends is when reality sends, and different tdma frame carries out sending in the different physical channels in BCH.As can be seen from Table 1, first tdma frame controlled in multi-frame sends in FCCH, and second tdma frame sends in SCH, and the 3rd-6 tdma frames send in BCCH.Because when carrying out drive test, in order to obtain RxLevel and CIR of each community in described position, the present embodiment uses the signal sent in the signal sent in FCCH, the signal sent in SCH and BCCH, so to described other data controlled in multi-frame, do not do too much introduction here.
Step 102: the drive test parameter calculating the drive test parameter of FCCH, the drive test parameter of SCH and BCCH.
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 described step 102 when the drive test parameter that calculating three channels are corresponding, 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 FCCH, the drive test parameter of SCH and BCCH, first obtain the drive test parameter of FCCH, secondly obtain the drive test parameter of SCH, the drive test parameter finally obtaining BCCH is carried out.Be described in detail to the acquisition process of drive test parameter corresponding to described three channels below.
1), the acquisition of the drive test parameter of FCCH
Shown in reference table 2, it is the signal sent in FCCH.
The signal sent in table 2FCCH
Wherein have the training sequence (FB) of 142 symbol lengths can for drive test, the acquisition process of the drive test parameter of FCCH be specially: first utilize Fourier transform to obtain in fcch channel and send power spectrum P_R_FCCH=[fft (the R_FCCH)] ^2 of signal at the Received signal strength of tested point.After obtaining the power spectrum of Received signal strength, the approximate power RXLevel_fcch of calibration of power value as the Received signal strength peak value of power spectrum being added FCCH, described RXLevel_fcch=max (P_R_FCCH)+FCCH_P_CORR.All non-zero power values beyond described spectrum peak are thought noise, then the power that 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 just obtaining FCCH transmission is CIR_fcch=10*log10 (max (P_R_FCCH)/P_N_FCCH) at the CIR of tested point.
2), the acquisition of the drive test parameter of SCH
Shown in reference table 3, it is the signal in SCH.
Signal in table 3SCH
Signal in described SCH has the training sequence T_SEQ of 78 information symbols (BCH1 and BCH2) and 64, 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 after channel, the signal received 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 CIR obtaining community, then need time domain impulse response and the interchannel noise of estimating channel.
Estimate that the process of the time domain impulse response of channel is as follows:
Cross-correlation calculation is done to R_SEQ and T_SEQ, obtains 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 is random sequence, its correlation function can think 0, then the expression-form of the Section 1 on the right of the equation of described formula (2) as shown in Equation (3):
Xcorr (T_SEQ, T_SEQ) * h=PR_T_SEQ.h formula (3)
The expression formula that can be obtained the channel time domain impulse response h_est estimated by described formula (2) and described formula (3) is h_est=xcorr (R_SEQ, T_SEQ)/PR_T_SEQ.
After obtaining the time domain channel shock response estimated, then can calculate the expression formula that training sequence T_SEQ arrives the signal of receiving terminal after channel is: 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 community are thus respectively:
RXLevel=sum(R_SEQ^2)/N；
CIR=10*log10（RXLevel/sum(Noise^2)/N)。
3), the acquisition of the drive test parameter of BCCH
Reference table 4 is the composition of the signal sent by BCCH in a tdma frame.
The composition of the signal sent by BCCH in table 4 tdma frame
The current training sequence in BCCH is used when calculating the drive test parameter of BCCH, because the signal that BCCH sends takies 4 tdma frames, so a drive test parameter will be obtained according to the training sequence in each tdma frame, finally obtain 4 drive test parameters are averaging the rear drive test parameter as BCCH.The implementation obtaining a drive test parameter according to the training sequence in each tdma frame with reference to the obtain manner of the drive test parameter of SCH, can repeat no more here.
Step 103: obtain the target weight coefficient that the drive test parameter of the drive test parameter of FCCH, the drive test parameter of SCH and BCCH is corresponding successively.
Because the length of the current training sequence used when calculating the drive test parameter of FCCH, the drive test parameter of the drive test parameter of SCH with BCCH is different, so the ratio of the length of total training sequence that can take according to the current training sequence in different physical channel determines the time weight coefficient that described three physical channel drive test parameters are 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 of use is L=142+64+26*4, then the time weight coefficient that FCCH is corresponding is a1=142/L, the time weight coefficient that SCH is corresponding is the time weight coefficient that a2=64/L, BCCH are corresponding is a1=26*4/L.
Step 104: summation operation is weighted, to obtain the target drive test parameter of current area at described drive test to be measured point to the drive test parameter of described FCCH, the drive test parameter of SCH, the drive test parameter of BCCH according to described target weight coefficient.
The time weight coefficient calculations target drive test parameter adopting the example in described step 103 to calculate, described, the current area finally obtained treats that RxLevel and CIR of drive test point is respectively: 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 the present embodiment, obtain the drive test parameter of the drive test parameter of described FCCH, the drive test parameter of SCH and BCCH, be equivalent to the time and the sampling number that add measurement drive test parameter, thus make the target drive test parameter obtained through weighted sum according to the drive test parameter of the drive test parameter of FCCH, the drive test parameter of SCH and BCCH have higher accuracy.And only carry out compared with drive test to a physical channel with prior art, the technical scheme of the present embodiment comprehensively can reflect the covering performance of each community at described drive test point to be measured, thus obtains the coverage information of GSM network more accurately.
Although the technical scheme of described embodiment 1 can improve the accuracy of drive test parameter, more fully reflect the coverage information of GSM network, but the length of the current training sequence in the current training sequence in SCH and BCCH is still less, this is influential to the precision of the target drive test parameter obtained, in order to improve the precision of target drive test parameter further, the invention provides the another kind of embodiment of the road measuring method in a kind of GSM mobile network, to improve the precision of target drive test parameter.
Shown in figure 2, be the flow chart of the road measuring method embodiment 2 in a kind of GSM mobile network provided by the invention, the present embodiment specifically can comprise:
Step 201: at drive test to be measured point, receives the information that community own base station sends in Preset Time window.
The implementation of described step 201 with reference to the implementation of described step 101, can repeat no more herein.
Step 202: the drive test parameter calculating FCCH according to the current training sequence in described FCCH.
The process of the drive test parameter of described acquisition FCCH with reference to the implementation of drive test parameter obtaining FCCH in described step 102, can repeat no more herein.
Step 203: the signal of SCH is decoded, and upgrade current training sequence.
Before solving the drive test parameter of SCH, first the information in SCH is decoded, in practical communication environment, training sequence is all known at transmitting terminal and receiving terminal, can be used for carrying out channel estimating, and data message is unknown at receiving terminal, needs to decode.The object of decoding to the signal of SCH is here the data message of 78 obtained by decoding in SCH, and as current training sequence together with the training sequence of the data message that obtains and 64 in SCH, increases the length of training sequence.Because the mode of decoding to signal is a lot, do not limit concrete decoding process here.
Whether correct in order to verify the decoding of signal, preferably, can adopt the mode of cyclic check to verify, concrete, the algorithm of cyclic check with reference to prior art, can repeat no more here.
Step 204: the drive test parameter calculating SCH according to the current training sequence upgraded in SCH.
The implementation of described step 204 with reference to the implementation of drive test parameter obtaining SCH in described step 102, can repeat no more herein.
Step 205: the signal of BCCH is decoded, and upgrade current training sequence.
The implementation of described step 205 can with reference to the implementation of described step 203, unlike, after decoding, need to upgrade the current training sequence in each tdma frame in BCCH.
Step 206: the drive test parameter obtaining BCCH.
The implementation of described step 206 can with reference to the implementation of drive test parameter obtaining BCCH in described step 102, unlike in described step 206 when calculating the drive test parameter of each tdma frame, use the 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 of acquisition 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 of acquisition is corresponding;
In practical communication, the equal power of the signal that described community own base station sends in described three physical channels is known, and the equal power of signal in three physical channels is equal.The reliability weight coefficient that the drive test parameter of described three physical channels is corresponding, can be obtained by a large amount of actual measurements and emulation.
Give an example, can be obtained by emulation in laboratory during reliability weight coefficient corresponding to described three physical channels, also can be obtained by actual measurement, be described to be retrieved as example by emulation in laboratory here.Acquisition process is as follows:
Because the equal power and the equal power of transmission signal on each physical channel that send signal are all known, so described transmission signal can be simulated by signal generator in 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, a sample of described signal correspondence not Signal reception power in the same time on three physical channels just can be obtained.Then, ask for multiple received signal power on SCH and send multiple received signal power on the variance of the equal power of signal on SCH, FCCH and send multiple received signal power and the variance sending the equal power of signal on SCH on the variance of the equal power of signal on SCH and BCCH.
Then, in upper once test, the power of Received signal strength on each channel can be obtained the accuracy of each channel divided by the variance of correspondence, the reliability weight coefficient of so corresponding physical channel is the result that the accuracy of this channel and the accuracy sum of three physical channels are divided by.Using the reliability weight coefficient that obtains as known quantity, do sum operation with coefficient at receiving terminal with the power of the Received signal strength on described reliability weight coefficient and corresponding physical channel, obtain a target received power estimated.
If the difference of the equal power of the target received power now estimated and transmitting terminal signal is larger, the received signal power of three physical channels then this obtained together with testing the received signal power of three physical channels obtained before several times as a sample of Signal reception power, recalculate the reliability weight coefficient of each channel, estimate the target received power of current time, until when the difference of the equal power of the target received power estimated and transmitting terminal signal is in preset range, just the reliability weight coefficient of obtain three physical channels can be carried out just can employing when actual drive test.
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 doing sum operation with coefficient to the power of receiving end signal, its role in whole measurement result can be reduced, make target measurement parameters can reflect the coverage condition of network more really.
Step 209: obtain target weight coefficient.
Described target weight coefficient can be the reliability weight coefficient of the respective channels obtained in described step 208, or, be the product of the reliability weight coefficient of the respective channels obtained in the time weight coefficient of respective channels and described step 208 obtained in described step 207.
Suppose that the reliability weight coefficient that described three channels are corresponding is respectively b_fcch, b_sch and b_bcch.
According to the example in described step 207 and step 208, known, the target weight coefficient that described three physical channels are corresponding is respectively: b_fcch*142/L, b_sch*142/L, b_bcch*142*4/L.
Step 210: calculate the target drive test parameter of current area at described drive test to be measured point.
Be be weighted summation operation with the drive test parameter of target weight coefficient to described three physical channels in this step, the described target drive test parameter obtained by described sum operation with coefficient 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。
The present embodiment is except realizing the beneficial effect in described embodiment 1, further, in the present embodiment, the current training sequence in SCH and BCCH is expanded, add the sampling number in physical channel, sampling number is more, and the drive test parameter calculated is more accurate.In addition, in the present embodiment, reliability sum operation with coefficient is carried out to the drive test parameter of each physical channel, reduce the impact of noise on target drive test parameter, further increase the precision of target drive test parameter, enable the drive test parameter recorded reflect the covering performance of network more really.
Accordingly, the present invention also provides the driver test system in a kind of GSM mobile network, and be the structural representation of described system with reference to figure 3, described system comprises:
Receiving element 301, at drive test to be measured point, receive the signal that current area own base station sends in Preset Time window, described signal at least comprises frequency correction channel FCCH signal, synchronous channel SCH signal and BCCH channel of broadcast control signal;
First computing unit 302, for calculating the drive test parameter of current area corresponding FCCH on described drive test to be measured point according to the current training sequence in described FCCH signal;
Second computing unit 303, for calculating the drive test parameter of current area corresponding SCH on described drive test to be measured point according to the current training sequence in described SCH signal;
3rd computing unit 304, for calculating the drive test parameter of current area corresponding BCCH on described drive test to be measured point according to the current training sequence in described BCCH signal;
Acquiring unit 305, the target weight coefficient that the drive test parameter for obtaining the drive test parameter of FCCH, the drive test parameter of SCH and BCCH is successively corresponding;
Arithmetic element 306, for being weighted average calculating operation, to obtain the target drive test parameter of current area at described drive test to be measured point according to described target weight coefficient to the drive test parameter of described FCCH, the drive test parameter of SCH, the drive test parameter of BCCH.
Preferably, shown in figure 4, in the driver test system embodiment 1 in a kind of GSM mobile network provided by the invention, the structural representation of described 3rd computing unit 304, described 3rd computing unit 304 specifically comprises:
First computation subunit 401, for according to the training sequence in each tdma frame of BCCH, calculates the drive test parameter that each tdma frame is corresponding successively;
Average subelement 402, for drive test parameter corresponding for tdma frames all in BCCH is got and is averaging, to obtain the drive test parameter of BCCH.
Preferably, shown in figure 5, in the driver test system embodiment 1 in a kind of GSM mobile network provided by the invention, the structural representation of described acquiring unit 305, described acquiring unit 305 specifically comprises:
Second computation subunit 501, for calculating the total length of the current training sequence on the current training sequence on FCCH, the current training sequence on SCH and BCCH;
Be divided by subelement 502, three first-phase division result that the length of current training sequence in the length that calculates the current training sequence on the length of the current training sequence on FCCH, SCH successively and BCCH and the total length of described current training sequence are divided by;
Determine subelement 503, for using the first-phase division result of described three channels as target weight coefficient.
Preferably, shown in figure 6, in the driver test system embodiment 1 in 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, for being weighted summation operation, to obtain target RxLevel according to the RxLevel of described target weight coefficient to RxLevel, BCCH of RxLevel, SCH of described FCCH;
Second Target Acquisition subelement 602, for being weighted summation operation, to obtain target CIR according to the CIR of described target weight coefficient to CIR, BCCH of CIR, SCH of described FCCH;
3rd Target Acquisition subelement 603, for using described target RxLevel and described target CIR as target drive test parameter.
Preferably, shown in figure 7, be the structural representation of the driver test system embodiment 2 in a kind of GSM mobile network provided by the invention, except all unit shown in Fig. 3, described system also comprises:
First decoding unit 701, for according to before the drive test parameter of the corresponding SCH on described drive test to be measured point of the current training sequence calculation plot in described SCH signal, decodes to described SCH signal;
First verification unit 702, obtains the first check results for carrying out cyclic check to decoded SCH signal;
First judging unit 703, for judging that according to described first check results decoded SCH signal is whether correct, if so, then using decoded SCH signal as the current training sequence in SCH signal.
Second decoding unit 704, for according to before the drive test parameter of the corresponding BCCH on described drive test to be measured point of the current training sequence calculation plot in described BCCH signal, decodes to described BCCH signal;
Second verification unit 705, obtains the second check results for carrying out cyclic check to decoded BCCH signal;
Second judging unit 706, for judging that according to described second check results decoded BCCH signal is whether correct, if so, then using decoded BCCH signal as the current training sequence in BCCH;
Obtain subelement 707, for obtaining the default reliability weight coefficient of the default reliability weight coefficient of FCCH, the default reliability weight coefficient of SCH and BCCH;
First-phase multiplier unit 708, for being multiplied as the first-phase division result of FCCH using the default reliability weight coefficient of FCCH with the first-phase division result of FCCH;
Second-phase multiplier unit 709, for being multiplied as the first-phase division result of SCH using the default reliability weight coefficient of SCH with the first-phase division result of SCH;
Third phase multiplier unit 710, for being multiplied the default reliability weight coefficient of BCCH as the first-phase division result of BCCH with the first-phase division result of BCCH.
In the technical scheme of the present embodiment, obtain the drive test parameter of the drive test parameter of described FCCH, the drive test parameter of SCH and BCCH, be equivalent to the time and the sampling number that add measurement drive test parameter.Thus make the target drive test parameter obtained through weighted sum according to the drive test parameter of the drive test parameter of FCCH, the drive test parameter of SCH and BCCH have higher accuracy.And only carry out compared with drive test to a physical channel with prior art, the technical scheme of the present embodiment comprehensively can reflect the covering performance of each community at described drive test point to be measured, thus obtains the coverage information of GSM network more accurately.
Further, expand the current training sequence in SCH and BCCH in the present embodiment, further increase the sampling number in physical channel, sampling number is more, and the drive test parameter calculated is more accurate.In addition, in the present embodiment, reliability sum operation with coefficient is carried out to the drive test parameter of each physical channel, reduce the impact of noise on target drive test parameter, further increase the precision of target drive test parameter, enable the drive test parameter recorded reflect the covering performance of network more really.
It should be noted that, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
For system embodiment, because it corresponds essentially to embodiment of the method, so relevant part illustrates see the part of embodiment of the method.System embodiment described above is only schematic, the wherein said unit illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
The above is only the specific embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles 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 in GSM mobile network, is characterized in that, comprising:
At drive test to be measured point, receive the signal that community own base station sends in Preset Time window, described signal at least comprises frequency correction channel FCCH signal, synchronous channel SCH signal and BCCH channel of broadcast control signal;
The drive test parameter of current area corresponding FCCH on described drive test to be measured point is calculated according to the current training sequence in described FCCH signal;
The drive test parameter of current area corresponding SCH on described drive test to be measured point is calculated according to the current training sequence in described SCH signal;
The drive test parameter of current area corresponding BCCH on described drive test to be measured point is calculated according to the current training sequence in described BCCH signal;
Obtain the target weight coefficient that the drive test parameter of the drive test parameter of FCCH, the drive test parameter of SCH and BCCH is corresponding successively;
According to described target weight coefficient, summation operation is weighted, to obtain the target drive test parameter of described community at described drive test to be measured point to the drive test parameter of described FCCH, the drive test parameter of SCH, the drive test parameter of BCCH.
2. method according to claim 1, is characterized in that, before the described drive test parameter according to the corresponding SCH on described drive test to be measured point of the current training sequence calculation plot in described SCH signal, also comprises:
Described SCH signal is decoded;
Cyclic check is carried out to decoded SCH signal and obtains the first check results;
Judge that decoded SCH signal is whether correct according to described first check results, if so, then using decoded SCH signal as the current training sequence in SCH signal.
3. method according to claim 1, is characterized in that, before the described drive test parameter according to the current training sequence calculating current area corresponding BCCH on described drive test to be measured point in described BCCH signal, also comprises:
Described BCCH signal is decoded;
Cyclic check is carried out to decoded BCCH signal and obtains the second check results;
Judge that decoded BCCH signal is whether correct according to described second check results, if so, then using decoded BCCH signal as the current training sequence in BCCH.
4. method according to claim 1, is characterized in that, the described drive test parameter according to the corresponding BCCH on described drive test to be measured point of the current training sequence calculation plot in described BCCH signal, specifically comprises:
According to the training sequence in tdma frame each in BCCH, calculate the drive test parameter that each tdma frame is corresponding successively;
Drive test parameter corresponding for tdma frames all in 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 target weight coefficient that the described drive test parameter obtaining the drive test parameter of FCCH, the drive test parameter of SCH and BCCH is successively corresponding, specifically comprises:
Obtain the total length of current training sequence, the current training sequence on SCH and the current training sequence on BCCH on FCCH;
Calculate three first-phase division result that the length of current training sequence on the length of the current training sequence on the length of the current training sequence on FCCH, SCH and BCCH and the total length of described current training sequence are divided by successively;
Using the first-phase division result of described three channels as target weight coefficient.
6. method according to claim 5, is characterized in that, using the first-phase division result of described three channels as before target weight coefficient, also comprises:
Obtain the default reliability weight coefficient of the default reliability weight coefficient of FCCH, the default reliability weight coefficient of SCH and BCCH;
The default reliability weight coefficient of FCCH is multiplied as the first-phase division result of FCCH with the first-phase division result of FCCH;
The default reliability weight coefficient of SCH is multiplied as the first-phase division result of SCH with the first-phase division result of SCH;
The default reliability weight coefficient of BCCH is multiplied as the first-phase division result of BCCH with 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, summation operation is weighted to the drive test parameter of described FCCH, the drive test parameter of SCH, the drive test parameter of BCCH, to obtain the target drive test parameter of described community at described drive test to be measured point, specifically comprise:
Summation operation is weighted, to obtain target RxLevel according to the RxLevel of described target weight coefficient to RxLevel, BCCH of received signal power RxLevel, SCH of described FCCH;
Summation operation is weighted, to obtain target CIR according to the CIR of described target weight coefficient to CIR, BCCH of Carrier interference ratio CIR, SCH of described FCCH;
Using described target RxLevel and described target CIR as target drive test parameter.
8. the driver test system in GSM mobile network, is characterized in that, described system comprises:
First receiving element, at drive test to be measured point, receive the signal that current area own base station sends in Preset Time window, described signal at least comprises frequency correction channel FCCH signal, synchronous channel SCH signal and BCCH channel of broadcast control signal;
First computing unit, for calculating the drive test parameter of current area corresponding FCCH on described drive test to be measured point according to the current training sequence in described FCCH signal;
Second computing unit, for calculating the drive test parameter of current area corresponding SCH on described drive test to be measured point according to the current training sequence in described SCH signal;
3rd computing unit, for, the drive test parameter of current area corresponding BCCH on described drive test to be measured point is calculated according to the current training sequence in described BCCH signal;
Acquiring unit, the target weight coefficient that the drive test parameter for obtaining the drive test parameter of FCCH, the drive test parameter of SCH and BCCH is successively corresponding;
Arithmetic element, for being weighted summation operation, to obtain the target drive test parameter of current area at described drive test to be measured point according to described target weight coefficient to the drive test parameter of described FCCH, the drive test parameter of SCH, the drive test parameter of BCCH.
9. system according to claim 8, is characterized in that, described system also comprises:
First decoding unit, for according to before the drive test parameter of the corresponding SCH on described drive test to be measured point of the current training sequence calculation plot in described SCH signal, decodes to described SCH signal;
First verification unit, obtains the first check results for carrying out cyclic check to decoded SCH signal;
First judging unit, for judging that according to described first check results decoded SCH signal is whether correct, if so, then using decoded SCH signal as the current training sequence in SCH signal.
10. system according to claim 8, is characterized in that, described system also comprises:
Second decoding unit, before calculating the drive test parameter of current area corresponding BCCH on described drive test to be measured point according to the current training sequence in described BCCH signal, decodes to described BCCH signal;
Second verification unit, obtains the second check results for carrying out cyclic check to decoded BCCH signal;
Second judging unit, for judging that according to described second check results decoded BCCH signal is whether correct, if so, then using decoded BCCH signal as the current training sequence in BCCH.
11. systems according to claim 8, is characterized in that, described 3rd computing unit specifically comprises:
First computation subunit, for according to the training sequence in each tdma frame of BCCH, calculates the drive test parameter that each tdma frame is corresponding successively;
Average subelement, for drive test parameter corresponding for tdma frames all in BCCH is got and is averaging, to obtain the drive test parameter of BCCH.
12. systems according to claim 8, is characterized in that, described acquiring unit specifically comprises:
Second computation subunit, for calculating the total length of the current training sequence on the current training sequence on FCCH, the current training sequence on SCH and BCCH;
Be divided by subelement, three first-phase division result that the length of current training sequence in the length that calculates the current training sequence on the length of the current training sequence on FCCH, SCH successively and BCCH and the total length of described current training sequence are divided by;
Determine subelement, for using the first-phase division result of described three channels as target weight coefficient.
13. systems according to claim 12, is characterized in that, described acquiring unit also comprises:
Obtain subelement, for obtaining the default reliability weight coefficient of the default reliability weight coefficient of FCCH, the default reliability weight coefficient of SCH and BCCH;
First-phase multiplier unit, for being multiplied as the first-phase division result of FCCH using the default reliability weight coefficient of FCCH with the first-phase division result of FCCH;
Second-phase multiplier unit, for being multiplied as the first-phase division result of SCH using the default reliability weight coefficient of SCH with the first-phase division result of SCH;
Third phase multiplier unit, for being multiplied the default reliability weight coefficient of BCCH as the first-phase division result of BCCH with the first-phase division result of BCCH.
14. systems according to claim 8, is characterized in that, described arithmetic element specifically comprises:
First object obtains subelement, for being weighted summation operation, to obtain target RxLevel according to the RxLevel of described target weight coefficient to RxLevel, BCCH of received signal power RxLevel, SCH of described FCCH;
Second Target Acquisition subelement, for being weighted summation operation, to obtain target CIR according to the CIR of described target weight coefficient to CIR, BCCH of Carrier interference ratio CIR, SCH of described FCCH;
3rd Target Acquisition subelement, for using described target RxLevel and described target CIR as target drive test parameter.
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| CN102137410A (en) * | 2010-01-26 | 2011-07-27 | 中国移动通信集团江苏有限公司 | Method and device for acquiring wireless channel parameter |
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