Alcatel-Lucent Wireless Broadband - Manual (Page 9)

Alcatel-Lucent End-to-End IP Wireless-Broadband Solution 9
To maintain reliable performance for
real-time applications, such as voice
over IP and video, the Alcatel-Lucent
WiMAX solution manages QoS dy-
namically, with traffic prioritization
across all network levels. Starting
with the request from the end-user
device, each network level commu-
nicates with the others to determine
the required QoS level for the session.
Then it dynamically checks the network
resources available, based on the
rights of the subscriber. And finally, packets are tagged accordingly, estab-
lishing end-to-end flows. The result is
outstanding QoS. The Alcatel-Lucent
WiMAX solution has recorded a
voice-quality Mean Opinion Score
of 4.1 out of 5.0 in urban field deploy-
ments – a higher level of quality than
demonstrated with top-quality GSM
codecs under ideal radio conditions.
However, IP traffic is much less predict-
able than in past wireless or cellular
networks. The Alcatel-Lucent
End-to-End IP Wireless-Broadband
Solution for WiMAX goes even
further, incorporating latest innova-
tions from Bell Labs to give unprec-
edented QoS/QoE guarantees. The
Alcatel-Lucent 9900 Wireless Network
Guardian is the first product on the
market providing simultaneous, real-
time visibility over every link of the
wireless broadband network where
overload could cause the network
to crash.
IP mastery for unrivalled QoS/QoE
WiMAX access
network
DSCP/802.1p
tagging in UL PEF
Transport plane
WAC Base
station
D
C
B
Application
client (SIP
user agent,
RTSP client)
WiMAX radio
interface
Session border
controller Device
A
Application
proxies (SIP,
RTSP proxies)
Access border
gate function
HA
Policy
function
IMS Video
streaming
NGN
DSCP/802.1p
tagging (DL/UL)
DSCP/802.1p
tagging in DL
Figure 3. Dynamic QoS managed across the network