WIRELESS SENSOR NETWORKS
Applications running on the
same Wireless Sensor Network (WSN) platform usually have different Quality of
Service (QoS) requirements. Two basic requirements are low delay and high data
integrity. However, in most situations, these two requirements cannot be
satisfied simultaneously. In this paper, based on the concept of potential in
physics, we propose IDDR, a multi-path dynamic routing algorithm, to resolve
this conflict. By constructing a virtual hybrid potential field, IDDR separates
packets of applications with different QoS requirements according to the weight
assigned to each packet, and routes them towards the sink through different
paths to improve the data fidelity for integrity-sensitive applications as well
as reduce the end-to-end delay for delay-sensitive ones.
WSNs, which
are used to sense the physical world, will play an important role in the next
generation networks. Due to the diversity and complexity of applications running
over WSNs, the QoS guarantee in such networks gains increasing attention in the
research community. As a part of an information infrastructure, WSNs should be
able to support various applications over the same platform. Different
applications might have different QoS requirements. For instance, in a fire monitoring
application, the event of a fire alarm should be reported to the sink as soon
as possible. On the other hand, some applications require most of their packets
to successfully arrive at the sink irrespective of when they arrive.
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