Summary of test methods for TD-SCDMA wireless network engineering

TD-SCDMA wireless network test method 1. Coverage Test

The coverage test scenario is divided into two types: outdoor and indoor. The outdoor coverage test is divided into two parts: radial pull distance and loop coverage. The radial pull distance test mainly completes the maximum coverage distance test on the radial direction of a single cell, and the loop coverage is mainly completed within the coverage of the residential area, measure the test taker's knowledge about the service quality and signal effect in different directions and geographic environments.

Before testing, you must first set the values of some cell parameters, such as the station type, broadcast channel code domain transmit power, the maximum code domain transmit power of a dedicated channel, and the upstream and downstream BLER target values) to get the coverage of a typical setting, so that the results are more informative. During the outdoor test, the test vehicle carrying road test equipment is used to drive at a speed less than 30 km/hour on the pre-selected test route, the test device and network side simultaneously record the relevant parameters of the terminal and system. In order to eliminate the contingency of the test results to the maximum extent, the number of tests is not limited to one, and should be determined flexibly according to the test conditions.

In the indoor test, dynamic coverage test and fixed-point static coverage test can be used. The dynamic test is used to test the continuous coverage of wireless network signals on a route in a building. The test method is similar to that of the outdoor test; static tests are used to test the coverage of specific locations in different penetration loss and different multi-path environments. Generally, the static tests are performed on different floors and different directions in a building, it is representative to select several testing sites with different penetration losses for various business tests, check the service quality of each point, and analyze the main factors affecting coverage based on the wireless network environment of the point.

In the radial test, each test should determine whether the service quality of various businesses meets the BLER target values of each business) as the cell boundary, that is, the BLER value of the upstream Business Channel measured by NodeB and the BLER value of the downstream business channel measured by UE are compared. The location that first exceeds the target value and then falls down is used as the edge of the residential area.

TD-SCDMA wireless network test method 2. Capacity Test

Maximum theoretical capacity of a single cell. For the TD-SCDMA system, the maximum theoretical capacity of various businesses can be calculated based on the codeword resources provided on each business time slot. To test the capacity, You need to verify whether the maximum number of connected users can reach or be close to the theoretical value in the actual environment. Specifically, capacity testing is divided into static testing and dynamic testing.

In static testing, terminals are evenly placed in pre-selected test sites, and specified services are initiated as required, the test terminal and the network side respectively record the changes of wireless network signals with the increase of the number of terminals until the maximum number of connected devices is reached. Select the static test location, it can be divided into multiple distribution conditions, such as a close point, a location with the same signal strength but different locations, and a location with different signal strength and different locations.

In the sports test, several test vehicles carry terminals respectively. After initiating the business, they drive at a speed below 30 km/hour on different test routes selected in the residential area, the test device and network side simultaneously record the relevant parameters of the terminal and system. In order to eliminate the contingency of the test results to the maximum extent, the number of tests is not limited to one, and should be determined flexibly according to the test conditions.

Similarly, to ensure that the test results under a typical setting are more informative, you must first specify the values of some parameters in the cell before testing. During the test, the maximum number of users meeting the service quality of each test should be taken as the determination principle of the residential capacity. That is, during the test, new UE is continuously connected to each test site, until the access is not stable, the total number of calls that can be stably accessed and maintained for a certain call time is used as the cell capacity.

The judgment of limited upstream and downstream network should be based on the terminal transmit power when the maximum number is reached and the total transmit power of the base station. When the total transmit power of the Base Station reaches the maximum, it is usually determined that the downlink is limited; otherwise, the uplink is limited; if the transmit power of the base station and the terminal is almost the same, at this time, it is determined that the upper and lower rows are limited at the same time. If the number of connected users reaches the theoretical maximum, that is, all the code domain resources are occupied, but the upstream and downstream power has not reached the maximum, it can be determined that the Code field is limited at this time, it is limited by the code domain resources provided by the system.

TD-SCDMA wireless network test method 3. Definition of Loading Method

Whether it is coverage testing or capacity testing, we should not only consider the impact of cross-frequency networking and same-frequency networking on the test results, but also consider the adjacent residential area and the local residential area coverage test) Whether there are results changes under user conditions, therefore, you need to make an agreement on the loading method.

There are two loading methods: real user loading and simulated loading. Real user loading uses other terminals to initiate actual services and load the test terminals; the simulated loading method generally uses the orthogonal channel noise source OCNS), that is, some physical channel resources of a certain time slot on the base station side are abbreviated as code channels ), uses an omnidirectional, random, or oriented beam to launch wireless network signals, simulating mobile users in the residential area to obtain interference with the residential area or adjacent residential area.

For more information about TD-SCDMA wireless networks, see TD-SCDMA wireless network engineering coverage and capacity testing.