Nowadays, the security is the blessed part of any communications system. For this reason, the next
generation mobile telecommunication system (LTE/SAE) is being prototyped for increased security and
reliable communication. Accordingly, it has several key differences compared to 3G and older versions like that the 4G network will become totally IP-Based. So, it will solve a lot of problem in terms of
interoperability across heterogeneous network environment but it will poses greater risks in terms of safety
and reliability. Furthermore, the mobility improvement is very important in any wireless network. For this, the
handover in LTE/SAE will be more frequent and should become more crucial, especially for the real-time
services.