查看文章

The third-generation partnership project (3GPP) introduces in release 13 the new radio access technology called narrowband internet of things (NB-IoT), which arouses in different operation modes with the idea to re-use the same LTE spectrum. These modes are stand-alone, guard band, and in-band. Consequently, the interference between these two technologies will affect the service to the end users to some extent within a heterogeneous network (HetNet) scenario. There are some studies which show that inband mode causes more interference due to the use of the same resource block by NB-IoT and LTE technology. Therefore, in this master thesis, an extensive investigation of interference caused by the new NB-IoT devices, in different HetNet deployment strategies is presented together with a cooperative power management approach. Those scenarios include the presence of NB-IoT either in Macro or in Small cell and considering if both technologies are synchronous or asynchronous. From the simulations is demonstrated that scenario 4 (Macro and Small Cells with NB-IoT) introduces more interference because both cells enable the power boosting of 6 dB [1]. Additionally, the cooperative method is implemented and studied, as a result, the method increases the performance of edges users approximately 14% to 70%.