Reliable data transport and congestion control in wireless sensor networks

Reliable data delivery and congestion control are two fundamental transport layer functions. Due to the specific characteristics of Wireless Sensor Networks (WSNs), traditional transportlayer protocols (e.g. Transmission Control Protocol (TCP) and User Datagram Protocol (UDP)) that are widely used in the Internet may not be suitable for WSNs.
In this paper, the characteristics of WSNs are reviewed and the requirements and challenges of reliable data transport over WSNs are presented. The issues with applying traditional transport protocols over WSNs are discussed. We then survey recent research progress in developing suitable transport protocols for WSNs. The proposed reliable data transport and congestion control protocols for WSNs are reviewed and summarised. Finally, we describe some future research directions of transport protocol in WSNs

Hierarchical Power Management in Disruption Tolerant Networks with Traffic-Aware Optimization

In this paper, the author investigates power management in DTNs with high randomness in the node mobility. Author presents a hierarchical power management framework, in which nodes control two radio interfaces to discover contacts. In addition, provides traffic aware approximation algorithms to save energy while discovering enough contacts to deliver the traffic load in the network. Simulation results from two mobility models show that generalized power management mechanism could achieve better energy efficiency than mechanisms relying only on one radio for contact discovery. In addition, when the traffic load can be predicted, approximation algorithms helps nodes to save significant amount of energy while handling the expected traffic load. Finally, the additional information allows the one-radio architecture to save equivalent energy to the two-radio architecture, overcoming the disadvantage of not having the additional radio.