A implementing method for planning a network of wireless communication system

0001Method for implementing network planning of wireless communication system

FIELD

0003The present invention relates to the field of wireless network communication technologies, and in particular, to a method for implementing network planning of a wireless communication system.

0004Background technique

0005Due to 3G (3^Rd Generation ) Network planning and optimization than 2G ( 2^Nd Generation) The GSM (Global System for Mobile Communications) network is much more complex. In the face of the large-scale construction of the upcoming 3G network, finding an efficient planning and optimization method is a concern of many communication equipment manufacturers. . To this end, a number of companies have been involved in 3G network planning methods and intelligent optimization research.

0006At present, in the 3G network planning, the more common method is to use 3G network planning simulation tools for network planning, specifically focusing on simulation based on certain propagation models, such as Forsk's Atoll network planning software, AirCom's Enterprise network. Planning software, both software provides an interface to the propagation model.

0007The flow of 3G network planning and simulation is shown in Figure 1. The specific implementation method is as follows:

0008The 3G planning network information, and the simulated propagation model, can calculate the cell pilot channel reception signal Ec (chip signal power) and Eclo (signal-to-interference ratio) of the 3G network planning area, and then according to the coverage threshold requirement of the target service, Perform coverage prediction of the target area service of the planning area, and provide a final 3G network planning solution, where the 3G planning information includes: location information of the station, antenna information, feeder information, cell information, and sector information. , device and business information, load size information, and more.

0009In the existing coverage prediction analysis with 3G network planning simulation tools, the corresponding propagation models need to be selected. Common propagation models include standard macro-cellular models and ray-tracing propagation models. The accuracy of the simulation network planning method depends largely on the accuracy of the propagation model.

0010The standard macrocell model is based on the cost-hata propagation model, although it can pass CW

0011(Continuous Wave, continuous wave) test for model correction, but because the ground object information is not used, the calculated propagation path loss accuracy is relatively poor, and the accuracy of the simulation plan is not high, so the significant shadow fading change of the urban area cannot be simulated. of.

0012The ray tracing propagation model can better simulate the urban propagation environment. Compared with the standard macrocell model, the calculation accuracy of the propagation path loss is much higher, but the vector information of the digital map is relatively high. Therefore, the ray tracing model needs to effectively use the feature information, including: parameter information such as feature type, feature height, and building height. In this way, in order to improve the accuracy of the propagation model, it is necessary to pass the CW test and use the test results to correct the relevant parameters of the ray tracing model, which makes the cost and workload of the network planning relatively high, greatly increasing the network planning. cost. Moreover, although the modified ray tracing model can improve the accuracy of planning simulation, due to the classification of features, the differences in propagation characteristics of different cells are blurred, and the accuracy of planning and simulation of ray tracing models is also limited.

0013Summary of the invention

0014In view of the above problems in the prior art, an object of the present invention is to provide a method for implementing network planning of a wireless communication system to improve accuracy for 3G network planning and optimization.

0015The object of the invention is achieved by the following technical solutions:

0016The present invention provides a method for implementing network planning of a wireless communication system, and performs planning of a new wireless communication system network based on the existing wireless communication system network;

0017A. Obtaining the drive test information of the existing wireless communication system network;

0018B. Calculate network parameter information in the wireless communication system network that needs to be planned according to the road test information, and adjust the network of the wireless communication system according to the calculated network parameter information.

0019The step A includes obtaining road test data information and obtaining road test auxiliary information, where the road test auxiliary information includes an existing wireless communication system network and a wireless communication system network that needs to be planned from the top of the network to the antenna. System configuration information.

0020The network parameter information includes:

0021The chip signal power and signal to interference ratio of the received signal. The step A described includes:

0022Get drive test data of 2G network, and road test auxiliary information of 2G and 3G networks. Moreover, the step B described includes:

0023Bl, calculating, according to the road test data of the 2G network, a path loss between the cell antenna in the 2G network and the sampling test point;

0024B2. Obtain a path loss of the corresponding cell antenna in the 3G network to the sampling test point according to the path loss calculation in the 2G network.

0025B3. Calculate a received signal level of the sampling test point in the 3G network according to the path loss in the 3G network;

0026B4, the received signal level value, and the desired received signal level value in the 3G network are adjusted for 3G network planning.

0027The step B1 described includes:

0028In the 2G network, determine the path loss value between the sampled test point received signal level value and the cell antenna to the sampling test point. ^ΡΙThe relational expression between ^ is:

0029= PBCCH,; ~ L_MISC__{2G I} + 0^__{20 1} - PL_{2G I}, among them:

0030^PBCC i is the transmit power of the base station of the 2G network;

0031It is the antenna feed loss of the transmitting end of the 2G network;

0032<^{3 2} 2G network antenna gain;

0033Calculating in the 2G network according to the relational expression.

0034The step B2 described includes:

0035The path loss value in the 2G network is corrected based on the working frequency band and the working frequency band of the 3G network, and the path loss between the corresponding cell antenna in the 3G network to the sampling test point is obtained.

0036The step B2 specifically includes: calculating a theoretical path loss value in the 2G network and the 3G network according to the network propagation model of the 2G network and the 3G network;

0037Calculating the theoretical difference between the path loss values ​​in the 2G network and the 3G network;

0038Calculating a path loss between the corresponding cell antenna in the 3G network to the sampling test point according to the path loss value calculated by the actual measurement in the 2G network and the theoretical difference value.

0039The step B2 further includes:

0040The path loss between the cell antenna and the sampling test point in the 3G network obtained after the modification is further corrected according to the region where the 3G network is located.

0041The step B3 described includes:

0042In a 3G network, based on the path loss value between the cell antenna and the sampling test point ^ΡΙ^ Calculate to determine the sample signal level value of the sample test point:

0043E^cPii₀t,i ⁼ Ppiiot, i ~ L_Misc__3G). + 0^— _3G,i - PL_{3G i} among them:

0044. y is the transmit power of the pilot channel of the top station cell of the 3G network base station;

0045L^Mi-^3G-ⁱThe antenna feed loss for the 3G network transmitter;

0046For 3G network antenna gain. The step B4 described includes:

0047Determining whether the received signal level value of the calculated 3G network meets the expected received signal level value in the 3G network, and if so, there is no need to adjust the already arranged base station and sector; otherwise, the calculated 3G network is obtained according to the calculation. The magnitude of the received signal level value is increased or decreased for the already placed base stations and sectors.

0048The method for implementing the network planning of the wireless communication system further includes:

0049C. Calculate a signal to interference ratio of a cell in the 3G network, and adjust the already arranged base station and sector according to the signal to interference ratio.

0050The step C specifically includes: calculating a signal power value of the serving cell received at the sampling test point in the 3G network; calculating a signal power value of all neighboring cells of the serving cell received by the sampling test point in the 3G network. with;

0051The signal-to-interference ratio of the sampling test point is calculated by using the signal power value of the serving cell, the sum of signal power values ​​of all neighboring cells, and the background noise value.

0052The method for implementing the network planning of the wireless communication system further includes:

0053Obtain the entire 3G network performance obtained based on each sampling test point plan, and adjust the base stations and sectors arranged in the entire 3G network obtained according to the expected planning result for the entire 3G network.

0054The method for implementing the network planning of the wireless communication system further includes:

0055Obtaining drive test data of the entire 3G network obtained based on each sampling test point plan; calculating a received signal level value of the sampling test point in the 3G network based on the drive test data;

0056If the received signal level value does not conform to a desired received signal level value in the 3G network, the already arranged base station and sector are adjusted according to the magnitude of the received signal level value.

0057The method for implementing the network planning of the wireless communication system further includes:

0058Calculating a cell signal to interference ratio in the 3G network based on the drive test data of the 3G network; if the signal to interference ratio does not meet a desired signal to interference ratio value in the 3G network, the base station and the fan that have been arranged according to the signal to interference ratio The area is adjusted.

0059Preferably, the step A includes: acquiring drive test data of a 3G network based on sampling test points;

0060The step B includes: calculating a received signal level value of the sampling test point in the 3G network based on the drive test data;

0061If the received signal level value does not conform to a desired received signal level value in the 3G network, the already arranged base station and sector are adjusted according to the magnitude of the received signal level value.

0062It can be seen from the technical solution provided by the present invention that the method of the present invention avoids the dependence on the network planning propagation model, but based on the true path loss between the cell antenna and the road measurement point in the road test area, and performs 3G. The network planning optimizes the received signal Ec and the signal-to-interference ratio Eclo coverage prediction of the regional target service. Therefore, the present invention greatly improves the accuracy of network planning. Moreover, the method of the present invention is simple and easy to implement, and the operator is more acceptable to the accuracy of the plan.

0063Moreover, if the operator has a 2G network, if the method of the present invention is adopted, the 3G network and the 2G network co-site address and the common antenna construction principle are planned, and the existing station and antenna can be maximized. , effectively reduce the cost of operators' network construction.

0064BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart of a 3G network planning simulation in the prior art;

00652 is a flowchart of a 3G network planning method provided by the present invention;

0066FIG. 3 is a flowchart of a 3G network optimization method provided by the present invention.

0067DETAILED DESCRIPTION OF THE INVENTION The core of the present invention is to obtain a 3G network cell pilot channel received signal level Ec by calculating a path loss between a drive test area and a related cell antenna._Pil._tAnd letter to dry than EcIo_Pil._tReceiving signal level Ec through the serving cell pilot channel_Pil._tAnd letter to dry than EcIo_Pil._t3G network planning or optimization to provide 3G network planning or optimization solutions.

0068The premise of the implementation of the present invention is that when the 3G network is planned, the 2G network is used as a reference, that is, the planning of the base station and the antenna in the 3G network is basically the same as that of the 2G network, that is, the 3G network adopts a common base station address with the 2G network. The principle of network construction of the common antenna, and then the base station site and antenna adjustment on this basis to obtain a satisfactory planning solution. In the actual 3G network rule process, it is usually convenient to select the site and reduce the network construction cost. If possible, the operator wants to plan based on the existing base station site.

0069In order to further understand the present invention, the processing of 3G network planning and optimization implemented by the present invention will be separately described below.

0070The following describes the processing procedure of the 3G network planning based on the road test data with reference to the drawings. As shown in Figure 2, the specific implementation process is as follows:

0071Step 21: Enter the drive test data information. In the 3G network planning phase, the road test data is a test signal of the 2G network;

0072The road test data includes: a level value of the received signal of the sampling test point (ie, the road test sample point), specifically including a level value of the received signal of the serving cell broadcast channel and a level value of the received signal of the adjacent cell broadcast channel;

0073Step 22: Enter the road test network auxiliary information;

0074The road test network auxiliary information includes: 2G network and 3G network antenna feeder system configuration information from the top port to the antenna, such as: feeder type, feeder length, jumper, power divider, coupler, antenna type, etc.;

0075By means of the road test network auxiliary information, when the 2G network and the 3G network share the antenna position, the antenna feed system gain difference between each antenna from the top of the antenna to the antenna is used, and is used for the pilot station cell pilot in the subsequent 3G network. Channel reception signal Ec_Pil._tCalculation.

0076Step 23: Calculate the pilot channel receiving signal Ec of the serving cell and the neighboring cell of the driving test area in the 3G network by using the road test data and the auxiliary information of the road test network._Pil._t;

0077First, through the downlink budget, the received signal levels of the 2G network and the 3G network cell i pilot channel can be respectively obtained. Generally, the receiving antenna gain of the 2G network test terminal is OdB, according to the 2G downlink budget. The calculation of the level of the received signal level of the BCCH (Broadcast Control Channel) of the cell i obtained by the sampling point can be calculated as follows:

0078R i ⁼ PBCCKU - L misc-2G,i + G _ant-2G,i― ^ 2G,i - where:

0079^Ri——The test level (dBm) of the BCCH channel of the serving cell is received by the 2G test terminal of the road test sampling point, and the value can be measured in the 2G network, that is, the drive test data in the 2G network;^Bcch'^!—— 2G BTS (Base Tran-receiver Station) base station top-of-line BCCH channel transmit power (dBm), which is a known parameter in 2G network; L_Mis. — ^1—2G transmitter antenna feed loss, including feeder loss, connector loss, jumper loss, etc. (dB), is a known parameter in 2G networks;

0080- a 2G antenna gain (dB), which is a known parameter in a 2G network;

0081PL^i1—the path loss (dB) from the antenna of the 2G cell i to the test sample point, which needs to be obtained by the above parameter values ​​and formulas;

0082Secondly, the receiving antenna gain of the 3G network test terminal is also OdB. Therefore, according to the 3G downlink budget, the pilot channel receiving level of the cell i is obtained at the drive test sampling point. ^Eep".' can be described as follows:

0083E° piiot,i ⁼ Ppiiot,i " L_Misc__3G). + G_Ant- _3G,i- PL_3Gji, among them:

0084P_Pil._t, i - _3GThe transmit power (dBm) of the pilot channel of the base station of the base station, which is a known parameter in the 3G network;

0085L_Misc- ₃ One- _3GTransmitter antenna feed loss, including feeder loss, connector loss, jumper loss, etc. (dB), is a known parameter in 3G networks;

0086G^——3G antenna gain (dB), which is a known parameter in the 3G network;

0087The path loss (dB) from the antenna of the 3G cell i to the test sample point needs to be based on ^PL2G'i value obtained;

0088Through the above description, it can be determined that: according to the link budget formula of the 2G network, the path loss between the 2G network path measurement point and the cell i can be calculated. ²⁽^; In addition, due to the difference between the 3G network path loss of the same waypoint sampling point and the 2G network path loss, the path loss difference caused by the frequency difference between the 2G and 3G networks can be analyzed. ^PlM, modified to obtain the corresponding path loss in the 3G network, namely: <img file="WO2006105716A1_D0001.tif" />

0089Where the PL_AfThe calculation can be carried out according to the propagation model applicable to the corresponding working frequency band of the 2G network and the 3G network, to calculate the path loss value of the respective simulation environment-based theory, and further calculate the theoretical path loss difference value, that is, ^p f; Therefore, the 2G network drive test data can be used to obtain the received signal level of the pilot channel of the 3G network wireless system cell i at the waypoint. ^ECP".", ie:

0090ECpihi'i = Rj + (Ppiiot,i - PBCCH,I ) ~ (L_mi_Sc— 3G, i― L_MISC_₂G,i) + (Gant-3G,i - C_ANT_₂G, i ) " . According to the above method, the receiving signal level of all the cell pilot channels of each sampling test point in the 3G network can be obtained. ^EePi'. '.

0091Step 24: According to the 3G network plan ^Εί;ρ".^ιThe request, the cell pilot channel receiving signal involved in the drive test area is performed. ^Eep".' signal correction;

0092Of course, if it is the initial planning process, there is no need for the relevant pilot channel Ec of the drive test area._Pil._tCorrection, but if it is in the validity verification stage of the planning optimization scheme, it is necessary to correct the received signal Ec of the relevant cell in the drive test area._Pil._t, such as adding a cell or closing a cell;

0093If the plan optimization scheme is to add a cell to the base of the 2G network, it is necessary to add the simulated simulated cell signal to the cell signal table of the drive test data point in the drive test data; if the plan optimization scheme is in 2G If a cell is closed on the basis of the network, the cell signal involved in the path measurement point needs to be deleted from the cell signal list;

0094If the plan optimization scheme is to adjust the engineering parameters of an antenna on the basis of the 2G network, the simulated pilot signal reception signal change value is simulated ^ ¹. After that, the data related to the measurement point of the cell needs to be corrected to:<img file="WO2006105716A1_D0002.tif" /> + AECpaot ; Therefore, in this step is the Ec calculated based on the 2G network drive test parameters according to the plan optimization plan._Pil._tAdjust to obtain the Ec of the pilot signals of each cell in the 3G network after planning adjustment_Pilotvalue.

0095Step 25: Calculate the pilot channel serving channel/neighbor cell pilot channel receiving signal to interference ratio EcIo in the 3G network_Pil._t; The calculation of the signal-to-interference ratio of the pilot channel of the cell i is as follows:

0096Ec pilot,

0097Eclo pilot,

0098Ii + ^ Ij + No ^ιΙ—the received power value (in W, watts) of the signal of the local cell (ie, serving cell) received at the drive test sampling point;

0099The sum of the received power values ​​of all signals of the neighboring cell j of the serving cell received at the drive test sampling point (unit: W, watt);

0100o one background noise (in W, watts);

0101殳Set parameters ^Pceiu , ^Pcell'j, . ^cp"." The unit of measurement has been converted into a unit of measure of watt W, so that the road test sample point receives signals from the cell.¹ i can pass the total transmit power and path loss of the serving cell i ^PathL.^Ssi to calculate:

0102Ec_Pilot x P_c

0103Pathloss_i PP,

0104E^C

0105Similarly, the road test sampling point neighboring cell j receives the signal¹ j can pass the total transmit power and path loss of neighboring cells of the serving cell ^{Path )SS}j to calculate:

0106I - PcellJ _ Pc l _ ^^C Pilot J ^X ^cellj

0107^J Pathlossj P_pilotJ P_pilolJ In this way, the test sample cell i receives the signal to interference ratio EcIo_Pil._t, i can be re-displayed by the following formula:

0108Ec "pilot,;! Ec ,

0109Eclo

0110p^iI° ― Ii +∑Ij + N₀⁼ Ec_pil0U x P_{cellJ y} Ec_{Pirol J} P_Cell

0111p ' p , Step 26: Ec based on calculation_Pil._t I EcIo_Pil._tThe value is used for target service coverage prediction, that is, the target service coverage prediction analysis is performed according to the threshold requirement of the target service;

0112So that in the subsequent processing, the Ec can be_Pil._t / EcIo_Pil._tIf the value does not meet the threshold requirement of the target service, adjust the planning optimization scheme, that is, adjust the base station or the antenna, so that the Ec is_Pil._t I EcIo_Pil._tThe value meets the requirements of the target business of the predetermined target.

0113Step 27: Perform corresponding network performance statistics on the entire 3G network obtained by the plan to analyze network performance such as optimal serving cell coverage, pilot pollution, and soft handover area of ​​the network; so as to facilitate service in subsequent processing When the network performance such as cell coverage, pilot pollution, and soft handover area does not meet the predetermined requirements, the base station and antenna in the planned 3G network can still be adjusted to obtain the best network performance.

0114Step 28: According to the target service coverage prediction completed in step 26 and the network performance statistics completed in step 27, determine that the target service coverage has a problem area;

0115Specifically according to Ec_Pil._t/EcIo_Pil._tThe target service coverage prediction and network performance statistical analysis can determine the problem areas in the planned 3G network.

0116Step 29: Provide a corresponding solution optimization solution for the problematic area; specifically: For problem areas that cannot meet the target service, such as Ec_Pil._tProblem area, you can add sectors or add new sites to solve the coverage problem; for EcIo_Pil._tIn the problem area, the original sector antenna engineering parameters bearing (main lobe direction) and down tilt (downward tilt) can be adjusted.

0117Step 210: The simulation simulation planning optimization scheme involves the adjustment of the road test data of the cell after the antenna engineering parameter is changed or the antenna is added;

0118In order to verify the target service coverage effect after adding a sector or adding a new station, the received signal Ec of the newly added cell in the road test area and the coverage area radius is simulated by simulation._Pil._tAnd merged into the original road test data by interpolation. After correcting the original road test data, recalculate the Ec of the road test area._Pilots EcIo_Pil._tPerformance, verify that the corresponding problem area has been resolved, and determine the feasibility of the solution;

0119In order to verify the target service coverage effect after the adjustment of the sector antenna engineering parameters, by simulating the antenna engineering parameters bearing, down tilt adjustment, corresponding to the signal change value of the cell sample in the road test area, and the original road involved in the sector Correct the measured data and recalculate the Ec of the drive test area_Pil._t, EcIo_Pil._tPerformance, verify that the corresponding problem area has been resolved, and determine the feasibility of the solution.

0120In order to further understand the present invention, the following will be referred to in step 23 above. ^PLThe calculation method of Af is described in detail as follows: The working frequency band of 2G cellular radio system is divided into 900MHz and 1800MHz, the working frequency band of 3G cellular radio system is near 2GHz, and the path loss of 2G road sample point is converted into the path of 3G same waypoint. When the loss occurs, it needs to be corrected according to the frequency difference.

0121For the 2G frequency band working at 1800MHz and the 3G working frequency band are similar, the propagation and loss characteristics of radio waves are similar. The propagation characteristics can be described by the Cost-Hata model, assuming that the 2G system operating frequency band is ^/2C- ¹⁸. . (MHz), the 3G system operating frequency band is

0122^(MHz), taking urban (urban) as an example, the theoretical path loss PL^ of the 2G network at the sampling test point can be calculated as follows:

0123P _2GI = 46.3 + 33.9 X log(/_2G_₁₈₀₀) - 13.82 x log(Hfc) - (f_2GJm, Hm) + [44.9— 6.55 x log(i»)] x log(rf) + Cm ;

0124Theoretical path loss of 3G networks ^PL3. i can be calculated as follows:

0125PL_3Gi = 46.3 + 33.9 X log(/_3G ) - 13.82 x log(J3⁄4) - a(/_3G , Hm) + [44.9 -6.55 x log(i3⁄4)] x \og(d) + Cm

0126among them:

0127Hm - the height of the mobile station;

0128Hb-one base station antenna height;

0129D—— the line of sight between the base station antenna and the road test sample;

0130Cm - OdB for suburban and medium density forests, 3dB for large cities; (f, Hm) a(f, Hm) = [1.1 x log(/) - 0.7] x Hm— [1.56 x log( ) — 0.8]. According to the above two calculation formulas, the theoretical path loss of the 2G network of the urban road test sample (ie, the sampling test point) can be obtained.^{PIj 2}Theoretical path loss for Gi and 3G networks ^ΡΙ^The difference in path loss between the same road sample points due to the frequency difference ^PLAf:

0131PL_Af = PL_3Gi _PL_2Gi

0132, = 33.9 * logl 0(/_3G / _2G_₁₈₀₀ ) - [a(f_3G , Hm) - a(f_2G__Im , Hm)] Assumption / _3G = 2000MHz, /_{2G 1800} = 1800MHz ^ _{5m ?} The actual path test data path loss calculation needs to be calculated according to the downlink frequency band of the operator, and the path loss difference caused by the 1800MHz and 2GHz frequency difference is analyzed according to different propagation environment scenarios. ^PLAf:

0133(1) For urban areas, the difference between 3G path loss and 2G path loss due to the 1800MHz and 2GHz frequency difference is ⁼ 1 ·⁵⁵Bu (0-075 - 0.071) = 1 M9dB , and a&lt;J_G, Hm, the frequency difference caused by the function has little effect and is basically negligible.

0134(2) For urban suburbs, it is necessary to correct the road loss formula based on the urban area, and the 2G path loss calculation formula is corrected to = ^PL2Gi + C_Suburbai, , 3G path loss formula corrected to PL₃Gi ⁼ PL₃Ffi + correction parameter „6„,1⁄2,, is -

0135^C >>. "⁼-2*[log(//28)]²- 5·4, due to _1800MThe 3G correction parameter due to the Hz and 2GHz frequency difference minus the 2G correction parameter is -0.34dB, and the 3G path loss due to the 1800MHz and 2GHz frequency difference in the urban suburb minus the 2G path loss difference value. ^PLM is PL_If =1.55-0.34 = 1.21^ , and the path loss difference PL of the urban area_AfBasically similar.

0136(3) For quasi-flat rural areas (with certain terrain fluctuations), it is necessary to make corrections based on the urban path loss formula, where:

0137The 2G path loss calculation formula is: ^PL2Gi = ^PL2Gi + ;

0138The 3G path loss formula is corrected to: ^{PL3Gi = PL3Gi} + ;

0139Correct the parameter C / -e"o" to .

0140C_Rl,_Rai_e 4.78*[log(/)]² + 18.33 *log( )- 35.94. Since the 3G correction parameter due to the 1800MHz and 2GHz frequency difference minus the value of the 2G correction parameter is -0.60dB, the 3G path loss caused by the quasi-flat rural 1800MHz and 2GHz frequency difference minus 2G Path loss difference value ^PLM =1·55- 0'6G = G'95 .

0141(4) For flat rural areas, it is necessary to make corrections based on the urban path loss formula.

0142The 2G path loss calculation formula is corrected to ^{PL∞i = PL2ffi} + ^Crthen¹First, the 3G path loss formula is corrected to PL3Gi ⁼ PL_3Gj + C_Rural__0pen , the correction parameters are:

0143C_Rural__0pen =—4.78 * [log( )]² +18.33* log( )― 40.94 The 3G correction parameter minus the 2G path loss due to the 1800MHz and 2GHz frequency difference minus the 2G correction parameter minus -2.60dB, the flat rural 1800MHz and 2GHz frequency difference minus the 2G path Loss difference value ^PLM =1·⁵⁵- Q.⁶G = G.⁹⁵ .

0144It can be seen from the above calculation results that for the road test data of the 2G 1800 working frequency band, when calculating the 3G path loss, since the working frequency bands of the two are relatively close, the frequency difference has little influence under different propagation scenarios, except The flat and open rural areas can basically ignore the differences between urban and suburban scenes.

0145For the 2G wireless system operating at 900MHz, the working frequency band is very far away from the 3G working frequency band 2GHz. The difference in reflection loss and diffraction during the propagation process is relatively large, and the two cannot share the same propagation model. The cost-hata model is 1500MHz~2000MHz, and the Okumura-Hata model is 1501000MHz. Therefore, the 900MHz 2G wireless cellular network system is suitable for the Okumura-Hata model. By analyzing the difference between the 900MHz 2G wireless system and the 3G wireless system propagation model, we can also obtain the path loss difference value caused by the frequency difference.¹"¹^. According to the Okumura-Hata model, the path loss between the urban 900MHz 2G wireless system road test sample and the cell i^PL∞i is calculated as follows:

0146P _2Gi=69.55 + 26.16xlog(/_{2G 9}. . )-13.82xlog(/3⁄4)-_a(/_2G-₉. . ,H )+[44.9-6.55xlog(/»)]xlog(i

0147among them:

0148Hm—the height of a mobile station;

0149Hb - the height of the base station antenna;

0150D—— the line of sight between the base station antenna and the test sample point;

0151"(/,H) a medium-sized city

0152"(/, Hm) = [l. logC ― 0.7] Hm-[l .56 x log(/)- 0.8]; when operating frequency f <= 200 MHz in large cities, «( m) = 8.29x[log (1.54xHm)]² -1.1. When the working frequency band f>= 400 MHz in a large city, a(^«) = 3.2x[l₀g(11.75xH )]²— 4.97. According to the cost-hata model, the path loss between the urban 3G wireless system road test sample and the cell i^pL₃. i is calculated as follows: PL_3GI = 46.3 + 33.9 x log(/_3C) -13.82 x \og(Hb)-α(/₃₀ , Hm) + [44.9 -6.55 x \og(Hb)] x log(J) + Cm

0153Using 3G path loss ^PL3Gi and 2G path loss¹"¹^, can calculate the path loss difference due to the frequency difference ^PLM _:

0154PL_Af = PL_3Gi - PL_2Gi

0155= (46.3 - 69.55) + [33.9 * Iogl0(/_3G ) - 26.16 * Iogl0 (/_{2G 900} )]― [a(f_3G , Hm)- a(/_{2G 900} , Hm)] + Cm = -23.25 + [33.9 * Iogl0( _3G) - 26.16 * Iogl0 (/_{2G 900} )]― [a(/_3G ,Hm)- a(f_2G_₉₀₀ , Hm)] + Cm Assumption /_3G= 2000MHz, f_2G__m = 900MHz ^ _3⁄4=15m? The actual path test data path loss calculation needs to be calculated according to the downlink frequency band where the operator is located, and the path loss difference is

0156^PLThe Af calculation formula can be further simplified:

0157PL_Af = -23.25 + [33.9 * logl0(2000) - 26.16 * logl0(900)] - [a(f_3G, Hm) - a(f_{2G 900},Hm)] + Cm = 11.38— [a(f_3G , Hm)― (f_2G_₉₀₀ , Hm)] + Cm The following analysis of the path loss difference caused by the 900MHz and 2GHz frequency difference according to the scene of different propagation environments ^PI^:

0158(1) For medium-sized cities, the difference between 3G path loss and 2G path loss due to the 900MHz and 2GHz frequency difference is:

0159PL_Af = 11.38— (1.1 * Hm— 1.56) * log(/_3G I f_{2G 9}. . ) + Cm = \\ 5dB · and " (/_3C, H) The frequency difference associated with the function has little effect and is basically negligible. (2) For large cities, the difference between 3G path loss and 2G path loss due to 900MHz and 2GHz frequency difference is^P = 11·³⁸ + ^ = 14.38.ffi.

0160(3) For the suburbs of the city, it is necessary to make corrections based on the path loss formula of the urban area.

0161The 2G path loss calculation formula is corrected to ^PL2Gi = ^PL∞i + , 3G path loss formula ^i is PL_3Gi = PL_3Gi + , Correct the parameter C toi to:

01622*[log(//28)]²—5.4. The value of the 3G correction parameter due to the 900MHz and 2GHz frequency difference minus the 2G correction parameter is -2.33dB. In the 3G suburban propagation model, we do not consider the correction parameter Cm related to the size of the city, so the 3G path loss caused by the 900MHz and 2GHz frequency difference in the urban suburb minus the 2G path loss difference value^PLM is ^PLM = 11-35 - 2.33 = Hall 9. (4) For quasi-flat rural areas (with certain terrain fluctuations), it is necessary to make corrections based on the urban path loss formula, where:

0163The 2G path loss calculation formula is corrected to ^{PL2Gi = PL2Gi + C} R ral _Qua_Si_Open;

0164The 3G path loss formula is corrected to ^PL3Gi = P^L3Gi ^{+ C} Rural _Qua_Si_Open;

0165Correct the parameter C""TM'_ β 0 to:

0166C_Rural__Qmsl__0pen = -4.78 * [log(/)]² +18.33 * log(/) -35.94 . Since the 3G correction parameter due to the 900MHz and 2GHz frequency difference minus the 2G correction parameter is -4.01dB, in the 3G rural propagation model, we do not consider the size of the city. Correct the parameter Cm, so the 3G path loss caused by the quasi-flat rural 900MHz and 2GHz frequency difference minus the 2G path loss difference value ^PLM = 11 -35 -4.01 = 7.34^ ( 5 ) For flat rural areas, it is necessary to make corrections based on the urban path loss formula.

0167The 2G path loss calculation formula is corrected to ^{PL2Gi = PL2Gi} + ^c^_Al__0Pe_n , 3G path loss formula 4 is positive for P Gi = PL_3Gi + C _Ruml Correct parameter C - Open is ·

0168C_{Rur 0pe}„ = -4.78 * [log( )]² + 18.33 * log( ) - 40.94 The value of the 3G correction parameter minus the 2G correction parameter due to the 900MHz and 2GHz frequency difference is -4.01dB. In the 3G rural propagation model, we do not consider the correction parameters related to the city size. Cm, therefore the 3G path loss caused by the flat rural 900MHz and 2GHz frequency difference minus the 2G path loss difference value ^PLM = 11.³⁵ - ⁴.01 = 7.34^5 From the above calculation results, it can be seen that for the road test data of the 2G 900 working frequency band, when calculating the 3G path loss, since the working frequency bands are far apart, the frequency difference is in different propagation scenarios. Poor path loss ^PlThe impact of M is very large. When calculating the path loss of 3G using 900MHz 2G drive test data, it is necessary to make corresponding corrections for different propagation environments. Therefore, the path loss difference PL between the path loss in the 2G network and the path loss in the 3G network_AfIt can be obtained by simulation calculation and is a constant. Thus, in the present invention, the path loss value in the 3G network can be conveniently calculated from the path loss in the 2G network.

0169The present invention also provides an optimized processing solution for the above-mentioned planned 3G network, and the specific implementation manner is as shown in FIG. 3, including:

0170Step 31: Obtain path test data of the entire 3G network after the planning based on each sampling test point, and perform a pilot signal receiving channel signal Εθρϋ in the road test area based on the road test data.₀₁And letter to dry than Ecl0p_U._tCalculation

0171That is to say, in the 3G network optimization phase, the 3G network optimization phase of the drive test data can directly sample and acquire the 3G network drive test area cell pilot channel receive signal Ec._Pil._tAnd the letter to the Eclopiiot, and then, based on the obtained values ​​for the optimization of the 3G network;

0172After the above values ​​are obtained, the specific optimization process is exactly the same as the process from step 24 to step 210 in the planning process described above, and will not be described in detail herein.

0173In summary, the method of the present invention does not rely on the corresponding propagation model for network planning, but based on the true path loss between the cell antenna and the road measurement point in the road test area, and performs the 3G network planning optimization area. The received signal Ec and the signal-to-interference ratio of the target service cover the prediction, and therefore, the accuracy of the network planning can be greatly improved. The invention is particularly applicable to the case where the operator has a 2G network and plans according to the 3G network and the 2G network co-site and the common antenna construction principle.

0174The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.