Analysis Method of TD-SCDMA Wireless Network Engineering Test Result

1. Overwrite Test Result Analysis

To fully and accurately analyze the coverage test results, it is necessary to ensure that some key upstream and downstream parameters can be accurately recorded during the test.TD-SCDMAFor system coverage testing, the main data that needs to be recorded in real time includes the following.

1) terminal side of the road test: the value of the received signal code domain power, Carrier Interference Ratio, UE transmit power, and BLER block rate of the downstream business channel must be recorded at each sampling point on the test route, path loss calculated by the RSCP and channel Tester of the downstream business channel; 2) system side: the transmit power of the TCP code domain of the downstream business channel during the test must be recorded ), upstream Business Channel RSCP and BLER.

Generally, the coverage of the P-CCPCH broadcast channel only needs to test the power of the received signal and the Carrier Interference Ratio of the downlink of the test route. When observing the coverage of the Business Channel, the data of the uplink and downlink needs to be merged according to the corresponding time or system frame number SFN, obtain the comprehensive information of upstream and downstream channels in the same location. Based on this information, a curve chart with the distance from the base station as the horizontal coordinate, the wireless parameters as the vertical coordinate, and a more intuitive MapInfo format with the electronic map as the background can be formed.

After obtaining the above test result diagram, you can obtain the coverage boundary of each business and the community under each condition based on the judgment criterion of the cell boundary and restriction condition, and according to the information given by the graphic, the reason for the limited coverage is obtained. At the same time, according to the change of path loss, the real-time changes of wireless signals at each sampling point can be obtained on the test route. On the one hand, the test results can be analyzed with assistance, on the other hand, the quality of existing network coverage can be evaluated to a certain extent based on the middle road and the ground environment of the community.

After obtaining the test results for each test case, you can put the test results together for comparison and analysis, thus, the TD-SCDMA network in the Multi-business operation, different frequency and the same frequency network conditions of wireless network planning for reference. Chinanetcenter, communication enterprise blacklist e

2. Capacity Test Result Analysis

Different from coverage testing, for Capacity Testing, key data of testing terminals and system testing needs to be recorded in real time in a phased manner as the number of terminals increases.

1) test terminal side: Record UE transmit power, BLER block rate of downstream business channel) value, RSCP of downstream business channel, ISCP interference signal domain power of downstream business channel) and so on;

2) system side: When recording the test terminal parameters, you must record the base station transmit power, total bandwidth received power, and TCP code domain transmit power of the downstream business channel during the test ), upstream business channels such as RSCP and BLER.

Taking the voice capacity test as an example, we usually record the above parameters when the number of users in each time slot reaches 2, 4, 6, and 8, and merge the above two data parts, obtain the comprehensive information of upstream and downstream channels with the same number of users. Based on this information, a curve is formed based on the number of users and the Wireless Parameters are vertical coordinates.

After the above curve is obtained, the maximum number of users in each business and under each condition can be obtained based on the criteria for determining the cell capacity and limitations. Based on the changes in the transmit power of the base station and terminal, analyze the causes of limited capacity. At the same time, based on the changes in wireless signal indicators that increase with the number of users, the transmission power of terminals and base stations is analyzed to find out the main factors that affect the cell capacity.

After obtaining the test results of each test case, you can put the test results together for comparison and analysis to obtain the capacity results of the same service under different network conditions. It is important to pay attention to the changes in the capacity of the same service under the influence of various networking or loading methods. Generally, the capacity under the condition of the closure of the adjacent residential area is used as a reference, compare the capacity under other loading conditions, and analyze the reasons for the Capacity change, so as to determine the appropriate community capacity planning based on the specific networking scheme.

Coverage testing and capacity testing are all key factors to measure the wireless network performance of mobile communication systems. To test the coverage and capacity of TD-SCDMA system in different environments and scenarios, the network performance of TD-SCDMA system can be understood, master the practical experience and experience parameters required for network planning and O & M, and accumulate experience for TD-SCDMA network construction.