Considering the development of a wireless next generation network (NGN),
the IP technology and the adaptation of its corresponding QoS-management
mechanisms applied at the different layers of their wired counterparts
such as WFQ-scheduling, resource reservation and signaling based on RSVP
as well as QoS-enhanced OSPF-routing are currently subjects of careful
investigations (cf. [19],
[20],
[28]). A main objective
of their new architecture is the decomposition of their network elements
and the separation into three levels of abstraction: the IP-based transport
platform offering switching and forwarding functions of the core and access
network, the control and signaling layer supporting resource and mobility
management, e.g. home and foreign agent functionality of Mobile IP, call
control and routing, as well as an application and multi-service layer
(see Fig. 1). This multi-service
platform includes adaptive and context-sensitive applications and it is
running on top of such transport and control infrastructure.
Figure 1:
Structure of the wireless domain of an NGN.
