5G uses a technology called millimeter wave(mmWave) to achieve high-speed data transfer up to Gigabits per second and low latency. The downside of this technology is the effective range is extremely short, and it cannot penetrate walls. Take a dual-band WiFi router as an example, there are the 2.4 GHz and 5.0 GHz channel. 2.4 GHz channel always has a strong and stable connection, but it is slower than the 5.0 GHz channel. On the other hand, when you are in another room from the router, your 5.0 GHz signal starts to drop. That’s the same situation with mmWave, higher the frequency, shorter the effective range, and harder to penetrate objects. Our research is to find possible solutions to solve this problem for 5G.