Solution for weak RSRP reception and improvement of signal coverage in a large room. For various rooms, check solution for DAS.

The solution includes an outdoor directional antenna (see option with outdoor omni antenna), lightning protection, BDA, indoor dome antenna, and low-loss cables with appropriate connectors. The drawing attached is specific for 1900MHz. For other carriers, if multi-band cellular BDA is used, use appropriate multi-band outdoor yagi antenna and indoor dome antenna. 

4G LTE  or  5G NR router anywhere in the room should be able to receive sufficient signal propagated from the the dome antenna.