Paper Info
Title
On the forwarding capability of mobile handhelds for video streaming over MANETs
Abstract
Despite the importance of real-world experiments, nearly all ongoing research activities addressing video streaming over MANETs are based on simulation studies. Earlier research shows that the limited resources of mobile handhelds, which are not modeled in most network simulators, can be a severe bottleneck. We study the capability of a modern handheld to perform one core task, which is the forwarding of video streams. We present end-to-end video quality and network measurements, along with an analysis of resource consumption. Our studies of the recent handheld Nokia N900 show that it can forward up to 3.70 Mbps. However, subjective video quality is compromised already at 3.35 Mbps, due to excessive delay. Our analysis unveils that direct memory access (DMA) relieves the CPU of forwarding overhead and that, due to the digital signal processor (DSP) support, additional coding overhead does not decrease the forwarding capacity. Finally, we find that power management impacts results considerably. It is possible to increase the forwarding capacity up to 27.4% by increasing the frequency of internal buses. Hence, our results demonstrate that the forwarding capacity is highly dependent on the internal state and activity of the device.
Year
DOI
Venue
2010
10.1145/1851322.1851332
MobiHeld
Keywords
Field
DocType
mobile handhelds,end-to-end video quality,network measurement,internal bus,video stream,forwarding capability,internal state,earlier research,subjective video quality,forwarding capacity,additional coding overhead,forwarding overhead,digital signal processor,video quality,direct memory access,network simulator
Bottleneck,Power management,Central processing unit,Computer science,Digital signal processor,Computer network,Subjective video quality,Mobile device,Direct memory access,Video quality,Embedded system
Conference
Citations 
PageRank 
References 
7
0.61
6
Authors
4
Name
Order
Citations
PageRank
Stein Kristiansen17211.86
Morten Lindeberg2343.34
Daniel Rodriguez-Fernandez370.61
Thomas Plagemann449669.84