In case of disasters when network infrastructure gets affected/not availability, in this case LTE device to device communication becomes essential way to enable communication between users. Though it is very useful technology but there are challenges to implement it w.r.t security and authorization. Unlike wifi, bluetooth, LTE D2D communication works on LTE licensed spectrum which results less interference. It also saves power if both the devices are in close proximity since it required less power transmission. It also provides high data rate transmission in case both users are in close proximity and base station is too far.
