CONCLUSION
In this paper, the study of 4G network evolution
and security challenges revealed that both LTE and
Wimax[14] resemble each other in flat network
architecture, having pure IP architecture, high
capacity ,wide coverage range etc. This study
explains the standards and evolution of 4G
network. It analysed the network architecture of
LTE and Wimax .The authentication process,
security challenges and models of 4G network were
discussed with more attention on the MAC layer
susceptibilities for LTE and Wimax. At MAC layer
Wimax is vulnerable to Denial of service attacks,
service degradation and key management, while
LTE also has its own set of susceptibilities which
are location tracking, bandwidth stealing and denial
of service. But at the physical layer, both LTE and
Wimax are subject to interference and scrambling
attacks which are the major problems in the
physical layer. Because of the open nature of IP
base 4G network, there is an increased likelihood
of security attacks, and therefore, multiple levels of
security including the follow; Encryption,
Authentication, Authorization, frequent key refresh
(Cryptanalysis) and Address concealment Increased
should be applied frequently