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In a Wireless Sensor Network, the medium access control (MAC) layer protocol design is very important due to the constraint of the limited processing capability and the power on wireless sensors. Recently, the IEEE released a revised version of the IEEE 802.15.4, referred to as IEEE 802.15.4e, which defined the Slotted Channel Hopping (TSCH) mechanism. The TSCH then adopted the slotframe structure...
By way of reducing the active time of sensor nodes, this paper proposed an energy efficient data convergence model which is adaptable for cold chain application. The model runs on hierarchical wireless sensor network architecture, which aims at finding an optimal sleep/wake up schedule that can coordinate the data sending time slot for both cluster nodes and routing nodes. It can avoid data re-transmission...
One approach to reduce the energy consumption of wireless sensors networks (WSNs) is to reduce the cost of idly listening to the channel by disabling (powering down) the transceivers in what is generally known as transceiver duty-cycling. Additionally, one can construct network coding (NC) schemes that allow a single transmissions to be of value to more than one receiver. In this paper, we account...
WSNs are inherently power constrained and are often deployed in harsh environments. As such, node death is a possibility that must be considered while designing protocols for such networks. Rerouting of data is generally necessary so that data from the descendant nodes of the dead node can reach the sink. Since slot allocation in TDMA MAC protocols is generally done based on the routing tree, all...
Recently, wireless sensor network is widely used. The deployment of WSN in the field, however, is still restricted due to limited energy supply, limited computing power, limited buffer size, and packet delay. In this paper we present a new cluster model and polling protocol integrating the schedule polling and low power listening scheme. The new clustering approach allows short routing between the...
We present a new scheme to reduce the end-to-end routing delay in the mission-critical applications of the wireless sensor networks (WSNs) under the duty cycle model. While greedy routing in the synchronized MAC model has been studied extensively, efficient routing in an asynchronous MAC model is considerably different because the wake-up time and availability of a node along the pre-decided path...
The benefits of using mobile sink to prolong sensor network lifetime have been well recognized. However, few provably theoretical results remain are developed due to the complexity caused by time-dependent network topology. In this work, we investigate the optimum routing strategy for the static sensor network. We further propose a number of motion stratifies for the mobile sink(s) to gather real...
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