Mobility: A Network Controlled Approach (original) (raw)

Envisioning a future where mobile terminals equipped with one or more network 9 devices are able to roam across wireless or wired networks, in a multi-diverse macro and micro wireless cells environment, requires the development of enhanced methods 11 to control IP based mobility. These methods should consider traditional terminal 12 mobility (mainly due to user movement) as well as mobility across heterogeneous 13 networks in the presence of semi-static users. For this to become reality, a cross 14 layer interaction starting from a potential large diversity of layer two access net-15 works up to the common IP layer is required, allowing the exchange of messages 16 between terminals and network components. Therefore, traditional host mobility 17 driven concepts need to meet more stringent mobile operator requirements in con-18 text of fully driven network controlled mobility. This paper presents and evaluates 19 a novel framework design, based on the IEEE 802.21 future standard, encompassing 20 network driven as well as host driven mobility 1 . 21 IP Mobility has been widely explored in the research community. IETF 2 pro-25 tocols, such as [1], [2], [3], [4] and their extensions or optimizations [5], [6], 26 are becoming mature and already first implementations are available for de-27 ployment. This is being paralleled by large scale ambitions, which will require 28 synergy across multiple technology aspects [7]. Liaisons between standardiza-29 tion bodies are happening with increasing frequency. As examples, 3GPP 3 30 (defining architecture reference scenarios for next generation Mobile Oper-31 ators networks), the WiMax forum 4 (defining the WiMax mobile reference 32 architecture) and the IEEE 5 802.21 working group (defining the standard 33 for enhanced vertical handover strategies) are actively discussing liaisons with 34 IETF to agree on a common set of requirements to ensure the compatibility 35 between architectures and protocols for mobility [8], [9], [10]. In other words, 36 while IETF mobility protocols use the IP layer as convergence layer, it still has 37