The document presents two Nonorthogonal Random Access (NORA) systems - NORA-A and NORA-B - for 5G networks proposed in a research paper. NORA allows multiple users to share the same bandwidth simultaneously by transmitting packets at one of two power levels, P1 or P2. The base station uses Successive Interference Cancellation to receive and decode packets. Simulation results show that NORA-B achieves higher throughput than NORA-A or traditional S-ALOHA by optimizing transmission probabilities based on user numbers. The maximum throughput of NORA-B reaches 0.65 packets per time slot.