Fig. 2

The VAM management application architecture. This is the VAM application design focusing on the functionalities located in the UE and MEC servers. In the MEC host, the VAM manager component manages the migration services of the UE with high mobility in the area, as well as the determination of the VAM and the modification of the VAM code. This VAM manager component, which is connected to the SFC application, has the right to determine the location of the migration task in the SFC and even decide whether to transfer the migration service to other MEC servers. This component facilitates SFC formation and SFC disengaging, as well as all UE joining/leaving the SFC. Furthermore, other UE that are not yet in the communication range of BSs can use the local VAM management component to start communicating with nearby MEC servers during the formation process. Other functionalities, residing in the cloud, take care of matching migration services with existing or new SFC and delegates tactical decisions to the correct MEC servers in case of sufficient resources. The encryption and decryption of the VAM code is the responsibility of the VAM encryption component, which is connected to the cloud servers for modifying regularly encryption parameters