KR20000032966A - Method for verifying capacity of cdma system - Google Patents

Abstract

PURPOSE: A method for verifying capacity of a Code Division Multiple Access(CDMA) system is provided to simultaneously take a service area test and a capacity test. CONSTITUTION: A method for verifying capacity of a CDMA system comprises the steps of: predicting theoretical service areas using a capacity and link estimate table during designing CDMA network(s1); estimating the above areas and setting a test route(s2); adding a forward link load and a reverse link load(s3); collecting field data (s4); and analyzing and comparing the test results(s5).

Description

Performance Verification Method of Code Division Multiple Access System

The present invention relates to code division multiple access (CDMA), and more particularly, to a method of verifying performance of a code division multiple access system under load condition under a single cell environment.

In order to verify the performance of CDMA, a test that calculates the expected service area using capacity and link budget in network design and actually collects data on the field to compare and verify theoretical and actual values It did not exist until now.

As described above, in the conventional CDMA performance verification method, there is a problem in that the service area and the capacity test are performed separately.

Accordingly, an object of the present invention is to solve the above problems by implementing a method for verifying the performance of CDMA by simultaneously performing a service area and a capacity test.

As a specific means of the present invention for achieving the above object, the step of predicting the theoretical service area using the capacity and link budget table in the design of the CDMA network; Predicting the zone and establishing a test route; Adding forward and reverse link loads after establishing the route; Collecting field data after adding the load; And analyzing and comparing the test results after the data collection.

1 is a performance verification step diagram of the code division multiple access system of the present invention.

2 is a reverse link load graph according to a method for verifying performance of a code division multiple access system according to the present invention.

3 is a flowchart illustrating a method for verifying performance of a code division multiple access system according to the present invention.

Hereinafter, described in detail with reference to the accompanying drawings, preferred embodiments of the present invention.

1 is a performance verification step diagram of the code division multiple access system according to the present invention. As shown in the figure, the theoretical service area prediction using the capacity and link budget table in the design of the CDMA network, the setting of the test route, the forward and reverse link load adding step, the field It consists of a data collection step and a result analysis and comparison step. The operation and effects thereof will be described in detail with reference to FIG. 2 as follows.

First, estimating the theoretical service area by using the capacity and link budget table in CDMA network design, the maximum allowable path loss is calculated by using the capacity table and link budget table in CDMA network design, and then the path loss model. Calculate the service area by applying Examples are shown in the capacity table Table 1, the link budget table Table 2 and FIG.

parameter General load overload Full load Spread bandwidth 1.2288 MHz 1.2288 MHz 1.2288 MHz Board ratio 9600 bps 9600 bps 9600 bps Treatment benefits 128 128 128 Voice activity 0.4 0.4 0.4 Other Cell Interference Fraction 0.66 0.66 0.66 Frequency reuse efficiency 0.6 0.6 0.6 Sector gain 2.55 2.55 2.55 Number of sectors 3 3 3 Need Eb / It 7 ㏈ 7 ㏈ 7 ㏈ Max user 33 33 33 Sector loading 63% 78% 84% Active user for the sector 21 26 28

parameter General load overload Full load Effective isotropic radiation power 23 ㏈m 23 ㏈m 23 ㏈m Antenna gain 0 ㏈i 0 ㏈i 0 ㏈i Fade limit 8.3 ㏈ 8.3 ㏈ 8.3 ㏈ Soft Handoff Gain 0 ㏈ 0 ㏈ 0 ㏈ Sector loading 63% 78% 84% Receiver interference limit -4.3 ㏈ -6.6 ㏈ -8 ㏈ Penetration loss 6 ㏈ 6 ㏈ 6 ㏈ Base Station Receive Antenna Gain 14 ㏈i 14 ㏈i 14 ㏈i Base station cable loss 4 ㏈ 4 ㏈ 4 ㏈ Base station noise symbol 5 ㏈ 5 ㏈ 5 ㏈ Need Eb / It 7 ㏈ 7 ㏈ 7 ㏈ Base Station Sensitivity -122.2 m -122.2 m -122.2 m Path loss 136.5 ㏈ 134.2 ㏈ 132.8 ㏈

Second, the step of setting the test route can be set as a circle route and a radius route. The circle route setting is used to set the frame error rate (FER) characteristics of a terminal located at a certain distance from the base station. To investigate, collect forward and reverse FER data in the service area. In addition, in setting the radius route, the vehicle is moved in a direction away from the base station to collect various data in order to investigate the maximum radius of the base station.

Third, the forward and reverse link load adding steps are classified into a forward link load adding method and a reverse link load adding method. The forward link load adding method is a method using an orthogonal channel noise source (OCNS). The OCNS is a software device that generates a channel pattern by Walsh code corresponding to a subscriber by traffic on a forward link of the CDMA in a predetermined pattern, thereby adding a load according to the number of subscribers without actually talking to a mobile phone. The comparison with the general call according to the number of OCNS is shown in Table 3.

channel Digital gain Output level Power ratio (%) Remarks Pilot 108 W ㏈m 20 (-7.0 ㏈) Synchronous signal 52 3.48 35.416 4.71 (13.27 ㏈) Proportion 1: 8 call 105 0.808 29.074 18.82 (-7.25 ㏈) Ratio 1: 1 Traffic 0 74 3.29 35.172 9.412 (-10.3 ㏈) Ratio 1: 1 Traffic 1 74 1.64 32.148 9.412 (-10.3 ㏈) Ratio 1: 1 Traffic 2 74 1.64 32.148 9.412 (-10.3 ㏈) Ratio 1: 1 Traffic 3 74 1.64 32.148 9.412 (-10.3 ㏈) Ratio 1: 1 Traffic 4 74 1.64 32.148 9.412 (-10.3 ㏈) Ratio 1: 1 Traffic 5 74 1.64 32.148 9.412 (-10.3 ㏈) Ratio 1: 1 total 17.4 42.41 100

Therefore, in the loading addition method, 6 digital gains are 74 and 1: 1 ratio in the case of general load, and 1: 1 ratio in case of digital load is 81 or 41 in case of full load and overload. Has a 1: 1 ratio when the digital gain is 70 or 41 for the normal load. In contrast, the reverse link load method is shown in Table 4 and FIG.

parameter Justice value E _b / N _o Signal energy per bit versus interference power spectral density 7 ㏈ F Frequency reuse efficiency One S Sector gain One v Voice activity 0.4 Rb Data rate 9600 bps W Bandwidth 1.2288 MHz

Fourth, in the field data collection step, the former circle route and the radius route are set, and data is collected by using a vehicle.

Fifth, the test result and the verification method should satisfy 1% FER in the service area by analyzing forward and reverse FER data for each load in the capacity test. In the service area test, the mobile reception power source and the transmission power source, E _c / I _o , and forward and reverse FER are analyzed for each load, and the service area is measured and compared with the service area in the network design.

As shown in FIG. 3, the main flow thus far is as follows.

The theoretical service zone is predicted using the capacity and link budget table in the design of the CDMA network (S1), the test route is established by predicting the zone (S2), and the forward and reverse links are established after the route is established. After adding the load (S3), collecting the field data after adding the load (S4), and showing the flow of the step of analyzing and comparing the test results (S5). At this time, in S1, the maximum allowable path loss is obtained, and then, the service area is calculated using the path loss model. And in (S2), a circle route and a radius route are set. In addition, in S3, an orthogonal channel noise source (OCNS) is used. Finally, in (S5), the capacity test and the service area test are performed.

As described in detail above, the present invention has the effect of effectively verifying performance by simultaneously performing capacity and service area tests.

Claims (5)

Predicting a theoretical service zone using capacity and link budget table in CDMA network design; Predicting the zone and establishing a test route; Adding forward and reverse link loads after establishing the route; Collecting field data after adding the load; And And analyzing and comparing test results after collecting the data. The method of claim 1, wherein the predicting the theoretical service zone using the capacity and the link budget table in the design of the CDMA network comprises: calculating the maximum allowable path loss and then calculating the service area using the path loss model. Characterized in that, the performance verification method of the CDMA system. 2. The method of claim 1, wherein predicting the zone and establishing a test route comprises establishing a circle route and a radius route. The method of claim 1, wherein the adding of the forward and reverse link loads after setting the route is performed by using an orthogonal channel noise source (OCNS). The method of claim 1, wherein analyzing and comparing test results after the data collection comprises performing a capacity test and a service area test.