1. Smart control for reliable
and energy-efficient video delivery
over a wireless network
IMEC’s Cross-Layer Technology Program
Gap
IMEC’s cross-layer (XL) Technology Program aims at drastically improving the
Energy requirement
quality of experience for future mobile multimedia services, by offering to the
users the best trade-off between energy consumption (or equivalently battery Energy available
in battery
lifetime) and perceived multimedia quality.
Time
There indeed exists a continuously growing gap between the available energy
Propagation
requirements
conditions
in the battery and the steeply increasing energy requirements of emerging
Application
multimedia wireless systems (top figure on the right). To bridge this gap, the
XL Technology Program designs smart controllers for new wireless multimedia t t
communication systems, The goal of the designed controllers is to minimize Cross-layer optimized
Run-time Performance/
the total energy consumption in the system, while providing the required Energy manager
quality expected by the user. Energy-scalable SDR
Baseband Front-end
WBA project: video-surveillance scenario
In the WBA project, this technique was applied to a video-surveillance scenario. The considered
scenario consists more specifically of multiple cameras sending video traffic to the access point of a
wireless local area network (WLAN). Different video quality levels can be required for the different
cameras from the control room.
Smart controller
AP-controlled MPEG4
Data
simple profile
TXOP
A smart controller was developed for the
considered scenario, enabling
UDP/IP to ensure the reliable and timely
Node 1 Node 4
Energy-Aware
AP
AP MAC delivery of the different real-time
Scheduler
QoE Manager
QoE Manager 802.11e video streams
PHY to minimize overall energy
802.11a consumption in the different camera
Node 2 Node 3
devices (in other words to maximize
(Channel Access Grant)
their battery lifetime).
Benefits
The proposed approach was shown to
save up to a factor 3 in energy
consumption (i.e., in battery lifetime)
when compared to state-of-the art-
approaches.
XL The proposed approach was shown to
guarantee video quality even though
data is transmitted over a wireless
network.
For more information please contact:
Antoine Dejonghe, Antoine.Dejonghe@imec.be