  The exponential growth of the number of multihomed mobile devices is changing
the way how we can connect to the Internet. Our mobile devices are demanding
for more network resources, in terms of traffic volume and QoS requirements.
Unfortunately, it is very hard to a multihomed device to be simultaneously
connected to the network through multiple links. The current work enhances the
network access of multihomed devices agnostically to the deployed access
technologies. This enhancement is achieved by using simultaneously all of the
mobile devices interfaces, and by routing each individual data flow through the
most convenient access technology. The proposed solution is only deployed at
the network side and it extends Proxy Mobile IPv6 with flow mobility in a
completely transparent way to mobile nodes. In fact, it gives particular
attention to the handover mechanisms, by improving the detection and attachment
of nodes in the network, with the inclusion of the IEEE 802.21 standard in the
solution. This provides the necessary implementation and integration details to
extend a network topology with femtocell devices. Each femtocell is equipped
with various network interfaces supporting a diverse set of access
technologies. There is also a decision entity that manages individually each
data flow according to its QoS / QoE requisites. The proposed solution has been
developed and extensively tested with a real prototype. Evaluation results
evidence that the overhead for using the solution is negligible as compared to
the offered advantages such as: the support of flow mobility, the fulfil of
VoIP functional requisites, the session continuity in spite of flows mobility,
its low overhead, its high scalability, and the complete transparency of the
proposed solution to the user terminals.
