keeping the CoA (Care of Address) mapping between its fixed
IPv6 address and CoA address for the current wireless
network. However, a mobile can be attached to several mobile
or wireless networks at the same time.[16] In such case, it
will maintain different IP addresses for each of the radio
interfaces,
While each of these IP addresses will be CoA address for the
FA placed in the mobile Phone. The fixed IPv6 will be
implemented in the mobile phone by 5G phone manufactures.
The 5G mobile phone shall maintain virtual multi-wireless
network environment. For this purpose there should be
separation of network layer into two sub-layers in 5G mobiles
(Fig. 3) i.e.: Lower network layer (for each interface) and
Upper network layer (for the mobile terminal). This is due to
the initial design of the Internet, where all the routing is based
on IP addresses which should be different in each IP network
world wide. The middleware between the Upper and Lower
network layers (Fig. 1) shall maintain address translation from
Upper network address (IPv6) to different Lower network IP
addresses (IPv4 or IPv6), and vice versa. Fig.2 shows the 5G
network layer.