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Reactive or proactive mobile applications require continuous
monitoring of their physical and computational environment to make
appropriate decisions in time. These applications need to monitor data
streams produced by sensors and react to changes. When mobile sensors
and applications are connected by low-bandwidth wireless networks,
sensor data rates may overwhelm the capacity of network links or of
the applications. In traditional networks and distributed systems,
flow-control and congestion-control policies either drop data or force
the sender to pause. When the data sender is sensing the physical
environment, however, a pause is equivalent to dropping
data. Arbitrary data drops are not necessarily acceptable to the
reactive mobile applications receiving sensor data. Data distribution
systems must support application-specific policies that selectively
drop data objects when network or application buffers overflow.
In this paper we present a data-dissemination service, PACK, which allows applications to specify customized data-reduction policies. These policies define how to discard or summarize data flows wherever buffers overflow on the dissemination path, notably at the mobile hosts where applications often reside. The PACK service provides an overlay infrastructure to support mobile data sources and sinks, using application-specific data-reduction policies where necessary along the data path. We uniformly apply the data-stream ``packing'' abstraction to buffer overflow caused by network congestion, slow receivers, and the temporary disconnections caused by end-host mobility. We demonstrate the effectiveness of our approach with an application example and experimental measurements.
Bibliographic citation for this report: [plain text] [BIB] [BibTeX] [Refer]
Or copy and paste:
Guanling Chen and David Kotz, "Application-controlled loss-tolerant data dissemination." Dartmouth Computer Science Technical Report TR2004-488, February 2004.
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