Image Processing Reference
In-Depth Information
In case the over-reserved resource in the requested CoS is insufficient on the path
, the ARC detects that QoS reservation readjustment is
necessary on the path. Since extra signaling for QoS readjustment on every node
on the path would incur processing and communication overhead—which directly
translates into additional energy cost, the SDNC must implement appropriate
algorithm to ensure overall optimization of the network service performance. As
discussed earlier, the SDNC can take into account the energy saving achieved in the
RAN and the energy cost spent for the extra signaling in the core network. The
SDNC may grant permission to switch to the new path only when the imposed
signaling cost does not outweigh the achieved energy saving.
Finally, the UEs
ER3, C1, C3, ER2
<
>
s decisions under appro-
priate control policies. For example, should it be worth to carry out the QoS
readjustment and accept the switching (e.g., based on SLA between the operator
and the users), the SDNC triggers the operations and the 3D media streaming is
switched to the new path in a seamless way to the end-user.
behaviours are subject to the SDNC
'
'
8.5 Summary
This chapter addresses energy efficiency for emerging 3D media applications
without compromising the required QoS. We adopt a novel approach and provide
guidelines bringing together cooperative communication techniques from RAN and
resource over-provisioning techniques from the core network. The proposed
approach ensures efficient integration of the RAN and the wired core network in
such a way as to enable differentiated QoS support and energy saving in a scalable
and end-to-end fashion. In this way, each network end-user will be able to enjoy a
minimum guarantee of QoS in terms of bandwidth, delay, jitter and packet loss
while experiencing longer battery lifetime achieved through intelligent selection of
the partner relay node(s). Moreover, the control allows optimal network resource
utilization and drastic reduction of the QoS control signaling overhead, which
undoubtedly translates into additional energy saving throughout the network. We
believe this approach is essential for the future green mobile and internetworking
designs to effectively enhance system overall performance.
Acknowledgments The authors would like to thank the support given by the ROMEO project
(grant number: 287896), which was funded by the EC FP7 ICT collaborative research programme.
References
1. Gartner (2007) Gartner Estimates ICT Industry Accounts for 2 Percent of Global CO2
Emissions.
http://www.gartner.com/newsroom/id/503867
. Accessed 11 July 2014
2. The Zettabyte Era—Trends and Analysis (2014).
http://www.cisco.com/en/US/solutions/
Accessed
