Abstract:
Narrowband-IoT (NB-IoT) is a standards-based Low Power Wide Area Network (LPWAN) technology developed to connect a wide range of new Internet of Things (IoT) devices and services. NB-IoT bandwidth is limited to a single narrow-band of 180 kHz. Although NB-IoT provides low-cost connectivity, it provides channel to large number of smart IoT installed in households, building etc. However, In NB-IoT systems, repeating same signal over additional period of time has been taken as a key technique to enhance radio coverage up to 20 dB compared to the conventional GPRS. Performance of NB-IoT system optimization and modeling is still challenging particularly coverage improvement in the case of real applications. For example, the narrow bandwidth in IoT and low power have led to diffectly in communication between IoT devices and network station, which results in low quality transmitter channel. Repetition process used enhanced coverage while increase number of repetitions leads to bandwidth consumption. So, Cooperative relay is used with repetition to solve this problem. In this thesis, we proposed an enhanced repetitions cooperative process of NPUSCH transmission channel. Results shows dramatical enhancement uplink NB-IoT channel quality when applied in to LTE networks. In addition, this thesis describes the analytical simulation to evaluate the proposed repetition of cooperative process (RCP) performance for LTE-NPUSCH channel.
