Fig. 6
From: Demonstrability of Narrowband Internet of Things technology in advanced metering infrastructure
The RSRP of the devices in different propagation environment. The RSRP of 81 selected test points in our measurements. Legend: the RSRP of indoor (3rd, 4th, and 5th floor) test points (blue); the RSRP of indoor (1st and 2nd floor) test points (red); the RSRP of outdoor test points (green); the RSRP of deep indoor test points (basement) (purple)