Abstract
We investigate a broadcast scenario that a mobile sink disseminating broadcast packets while moving in asynchronous wireless sensor networks (WSNs), to prolong the network lifetime and reduce the broadcast delay. Such a scenario may yield multiple logical sink nodes in WSNs and the moving speed and trajectory of the mobile sink have the significant impact on the speed and efficiency of the broadcast. Thus, the conventional broadcast protocols may not fit for the mobile sink scenario. We propose a fast and efficient broadcast (FEB) protocol with a mobile sink in asynchronous WSNs. We analyze the moving pattern as well as the travel speed of the mobile sink. We jointly consider the broadcast process, the node location, and the neighbor coverage information within two-hops and then propose an efficient broadcast scheme together with a heuristic moving strategy for the mobile sink. The proposed broadcast scheme needs to exchange node coverage information before the transmission begins, thus to avoid redundant packet transmissions, and the proposed moving pattern strategy decreases the network broadcast delay by moving the mobile sink to monitoring areas, where fewer nodes are covered by the broadcast process. The simulation results show that our proposed protocol significantly reduces the broadcast delay and energy consumption.
Highlights
Broadcast is a fundamental service in wireless sensor networks (WSNs), in which sensor nodes deliver messages across the whole network, and it serves a wide range of higher-level operations such as networking configuration, data collection, and event observation
In order to achieve fast and efficient broadcast while reducing broadcast delay and prolonging the network lifetime in a low-duty-cycle WSN with the mobile sink, we propose a fast and efficient broadcast protocol in this paper
DESIGN OF THE PROPOSED fast and efficient broadcast (FEB) PROTOCOL In our paper, we consider how to reduce the number of transmissions, which compromises the main part of energy consumption [18], and broadcast latency for broadcasting a single packet with the help of the mobile sink
Summary
Broadcast is a fundamental service in wireless sensor networks (WSNs), in which sensor nodes deliver messages across the whole network, and it serves a wide range of higher-level operations such as networking configuration, data collection, and event observation. Forwarders nodes which receive broadcast packets coordinate with each other based on broadcast progress information and delegate the uncovered neighbors to the covered ones with better link qualities.. Several asynchronous duty-cycling broadcast protocols have been proposed that adopted global guidance to reduce the number of collisions and redundancy, such as a minimum spanning tree [7], an energy-optimal tree [11], and a minimum-delay yet energy-efficient flooding tree [12]. Note in these scenarios with single sink, the sink is regarded as the root of the tree. The mobile sink keeps moving and stops when it receives a beacon request packet from a sensor node to cover itself
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