An Automatic Fall-back Based Handover Mechanism for Future Generation Wireless Networks

With increasing number of users and multimedia applications, bandwidth efficiency in cellular networks has become a critical aspect for system design.Bandwidth is a vital resource shared by wireless networks.Hence its in critical to enhance bandwidth efficiency.Orthogonal Frequency Division Multiplexing (OFDM) and Non-Orthogonal Multiple access (NOMA) have been the leading contenders for modern wireless networks.NOMA is a technique in which multiple users data is separated in the power domain.A typical cellular system generally has the capability of automatic fallback or handover.In such cases, there can be a switching from one of the technologies to another parallel or co-existing technology in case of changes in system parameters such as Bit Error Rate (BER) etc.In the proposed approach NOMA with successive interference cancellation is proposed.Moreover a handover between NOMA and OFDM has been designed with automatic fallback enabled receivers.The condition for switching or handover has been chosen as the BER of the system.A comparative analysis with existing work shows improved performance as compared to existing techniques in terms of SNR requirement thereby making the system more practically useful for fading channel conditions.