C. Protocol Conversion
The protocol stacks of 6LoWPAN and the User Equipment
(UE), which is the last node in the access layer of E-UTRAN
are not the same. Therefore, protocol conversion should occur
in the gateway to make the receiving packets compatible with
the LTE-A network and vice versa. The protocol stacks of
6LoWPAN and UE are shown in Fig. 5.