* Co-existence with legacy standards (users can transparently start a call or transfer of data in an area using an LTE standard, and, should coverage be unavailable, continue the operation without any action on their part using GSM/GPRS or W-CDMA-based UMTS)
[[Image:3GPP LTE protocol stack.jpg|center|900 px|thumbnail| '''3GPP LTE protocol stack''']]]
===Companies===