Intertwined Medium Access Scheduling of Upstream and Downstream Traffic in Wireless Sensor Networks
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Date
2013-12-25
Journal Title
Journal ISSN
Volume Title
Publisher
CERIST
Abstract
In wireless sensor networks, the sensor data are often aggregated en-route to the base-station
in order to eliminate redundancy and conserve the network resources. The base-station not only
acts as a destination for the upstream data traffic, but it also configures the network by transmit-
ting commands downstream to nodes. The data delivery latency is a critical performance metric
in time-sensitive applications and is considered by a number of data aggregation schemes in the
literature. However, to the best of our knowledge, no solution has considered the scheduling of
downstream packets, originated from the base-station, in conjunction with upstream traffic. This
paper fills such a gap and proposes MASAUD, which intertwines the medium access schedule of
upstream and downstream traffic in order to reuse time slots in a non-conflicting manner and
reduce delay. MASAUD can be integrated with any scheme for data aggregation scheduling. The
simulation confirms the effectiveness of MASAUD.
Description
Keywords
Wireless sensor network, Data aggregation, Medium access scheduling