The link budget can instruct to plan the plot radius establishment and the station site distribution, under the different environment the link budget method is completely consistent, only will be the link budget parameter will have certain difference, should act according to the different environment selection appropriate link budget parameter. The commonly used method is tests through Che Zai, obtains the local path loss test data, then through plans with the method, item and the terrain feature factor carries on the adjustment with these data to primitive dissemination model formula's each coefficient, after causing the adjustment, the formula predicted value and the measured data error are smallest. Thus, the process will adjust the later dissemination model path loss forecast the accuracy to enhance greatly, can compare reflects the local wireless dissemination environment well the characteristic. The vehicle carries the test model to have 2 kinds, one kind is the CW test, another kind of test is the present net test, may provide the accurate forecast based on the CW test's dissemination model adjustment result for the network planning, in XX city network design is through the CW test, obtains in the path loss data correction original dissemination model according to the data processing the function coefficient, causes the model the test value and the true error is smallest.The 3G service already includes the present GSM/GPRS on-line existing voice feature, the data traffic as well as other value-added service, also includes the 3G network unique new service, like videophone, class media service and so on.
