EWDC '11 Proceedings of the 13th European Workshop on Dependable Computing
Audio-on-demand over wireless sensor networks
Proceedings of the 2012 IEEE 20th International Workshop on Quality of Service
Voice quality improvement with error concealment in audio sensor networks
WWIC'12 Proceedings of the 10th international conference on Wired/Wireless Internet Communication
Journal of Network and Systems Management
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Recent years have witnessed the pilot deployments of audio or low-rate video wireless sensor networks for a class of mission-critical applications including search and rescue, security surveillance, and disaster management. In this paper, we report the design and implementation of Quality-aware Voice Streaming (QVS) for wireless sensor networks. QVS is built upon SenEar, a new sensor hardware platform we developed for high-bandwidth wireless audio communication. QVS comprises several novel components, which include an empirical model for online voice quality evaluation and control, dynamic voice compression/duplication adaptation for lossy wireless links, and distributed stream admission control that exploits network capacity for rate allocation. We have extensively tested QVS on a 20-node network deployment. Our experimental results show that QVS delivers satisfactory voice quality under a range of realistic settings while achieving high network capacity utilization.