4G problem areas
Higher susceptibility to inter-cell interference Higher variation in the instantaneous power (due to OFDM-based architecture) that impacts power amplifier efficiency Incompatibility with previous generations Over 40 frequency bands make global roaming difficult Poor voice support High cost of embracing LTE, including high auction costs for acquiring spectrum, lack of economy of scale to make available reasonably-priced user devices, and putting together the backhaul infrastructure 7. Need to set up newer operations and management systems, including provisioning, performance optimisation, revenue realisation, fault handling and maintenance, security management, etc 1. 2. 3. 4. 5. 6.