We have realized our NGN concept by a QoS enhanced LINUX implementation
at a testbed consisting of an IEEE802.11b compatible WLAN with Mobile IPv4
as network and standard TCP as transport layer (cf. [5]).
The WLAN is created by Lucent's WaveLAN products running in the ISM band
at about 2.4 GHz (cf. [3],
[4]) and the QoS-support schemes
at the flow and packet levels, e.g. packet classifier, class-based, priority
and FIFO queueing and token-bucket shaper are provided by the LINUX enhancements
(cf. [5], [15]).
The network structure is shown in Figures 7
and 8 (see also 9).
Figure 7:
Testbed with overlapping
microcells generated by two access points (Lucent's WavePOINTS).
Figure 8:Network structure
of the wireless LAN and its Mobile IP configuration.
It comprises two overlapping microcells that are generated by two access
points (APs), i.e. Lucent's WavePOINTS, with two foreign agents running
on the hosts Aldebaran (142.2.4.129/142.2.14.28) and Orion (142.2.4.65/142.2.14.24),
the home network 142.2.14.0/24, the corresponding home agent at the host
Deneb (142.2.14.10), the mobile nodes (MNs) Merkur (141.2.14.7) and Uranus
(141.2.14.13) and the correspondent host Sirius (141.2.14.21).
Subsections
![\includegraphics[scale=0.38, angle=0]{figures/telefunk.eps}](../../../CDROM/alternate/360/telefunk.gif)