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Cooperative communication is an emerging and effective technology which can overcome the limitation and improve overall system performance of wireless networks. As important design parameters, relay selection, power and bandwidth allocation have been investigated respectively in previous literature. However, most of the existing schemes mainly consider single-relay selection, which may result in imbalance...
Controlled mobile helper nodes called data ferries have recently been proposed to bridge communications between disconnected nodes in a delay-tolerant manner. While existing work has explored various trajectory designs for the data ferry by assuming either static nodes or full observations at the data ferry, the problem remains open when the nodes are mobile and the ferry only has partial observations...
Security is an important aspect for the future wireless networks. Since the number of network nodes increases constantly, and, in addition, the networks are decentralized and ad-hoc in nature, it becomes more challenging to apply the current cryptographic methods that require exchange of keys between the communicating parties. Information-theoretic secrecy is an emerging security field that explores...
Energy efficiency and long network lifetime has been of a great interest in wireless sensor networks. In addition to delivering data to the base station, a routing protocol must be energy efficient. An efficient routing technique is known as hierarchical routing based on clustering. In this paper, wireless sensor network is considered with a mobile base station. After clustering the nodes and selecting...
For achieving higher end-to-end throughput of data messages in wireless multihop networks, collisions and contentions among wireless nodes in a transmission route are required to be avoided or reduced. Under an assumption that each wireless node communicates by using a single channel, collisions are avoided by RH2SWL since a transmission route consists of a sequence of hop-by-hop shortening wireless...
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