Abstract
The basic operation of a Delay Tolerant Sensor Network (DTSN) is to finish pervasive data gathering in networks with intermittent connectivity, while the publish/subscribe (Pub/Sub for short) paradigm is used to deliver events from a source to interested clients in an asynchronous way. Recently, extension of Pub/Sub systems in DTSNs has become a promising research topic. However, due to the unique frequent partitioning characteristic of DTSNs, extension of a Pub/Sub system in a DTSN is a considerably difficult and challenging problem, and there are no good solutions to this problem in published works. To ad apt Pub/Sub systems to DTSNs, we propose CED, a community-based event delivery protocol. In our design, event delivery is based on several unchanged communities, which are formed by sensor nodes in the network according to their connectivity. CED consists of two components: event delivery and queue management. In event delivery, events in a community are delivered to mobile subscribers once a subscriber comes into the community, for improving the data delivery ratio. The queue management employs both the event successful delivery time and the event survival time to decide whether an event should be delivered or dropped for minimizing the transmission overhead. The effectiveness of CED is demonstrated through comprehensive simulation studies.
Highlights
The traditional sensor network is composed of a large number of densely deployed sensor nodes with short range radio and several sink nodes, and sensors in the network collaborate together to collect the target data and transmit them to the sink nodes
We propose a community-based event delivery protocol (CED) that adapts Pub/Sub systems to delay tolerant sensor network (DTSN)
We find out that the performance of CED varies with different values of event successful delivery time α. e.g. the data delivery ratios of CED varying with different values of α are shown in
Summary
The traditional sensor network is composed of a large number of densely deployed sensor nodes with short range radio and several sink nodes, and sensors in the network collaborate together to collect the target data and transmit them to the sink nodes This approach, may not work effectively in scenarios with extremely low and/or intermittent connectivity due to sparse network density, obstacles, sensor node mobility or sensor energy exhaustion and so on. We propose a community-based event delivery protocol (CED) that adapts Pub/Sub systems to DTSNs. In our design, event delivery is based on several unchanged communities, which are formed by sensors in the network according to their connectivity.
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