Co-channel Interference of TD-LTE Wireless Network in Smart Grid

Abstract

As a private wireless network of smart grid, TD-LTE network use the same frequency band with other dedicated TD-LTE networks. There is an issue of co-channel interference to be studied. The co-channel interference could be described by Reference Signal Receiving Power (RSRP), Signal to Interference Plus Noise Ratio (SINR) at certain scrambling level and different interference field intensity. This paper presents a method to test the tolerance of the interference field intensity and the reference value of SINR in a certain RSRP value, with QoS as the evaluation index. The paper firstly investigates the category of smart grid services and Quality of Service (QoS) attribute value base on the specifications of power grid. Then the definition and causes of co-channel interference in LTE network are analyzed, and the method to evaluate the co-channel interference is given. Furthermore, a test by using the proposed method is given in the laboratory environment. More than 200 times of tests are repeated, and the delay, packet loss rate and throughput are obtained. The conclusion is finally given by comparing the test value with the required value of QoS. The data obtained in this test will provide reference for the design and optimization of the TD-LTE wireless network. And the method can be further used in the selection of the critical value of the finer network terminal RSRP.