Abstract
The IEEE 802.15.4 standard is widely recognized as one of the most successful enabling technologies for short range low rate wireless communications and it is used in IoT applications. It covers all the details related to the MAC and PHY layers of the IoT protocol stack. Due to the nature of IoT, the wireless sensor networks are autonomously self-organized networks without infrastructure support. One of the issues in IoT is the network scalability. To address this issue, it is necessary to support the multi-hop topology. The IEEE 802.15.4 network can support a star, peer-to-peer, or cluster-tree topology. One of the IEEE 802.15.4 topologies suited for the high predictability of performance guarantees and energy efficient behavior is a cluster-tree topology where sensor nodes can switch off their transceivers and go into a sleep state to save energy. However, the IEEE 802.15.4 cluster-tree topology may not be able to provide sufficient bandwidth for the increased traffic load and the additional information may not be delivered successfully. The common drawback of the existing approaches is that they do not address the poor bandwidth utilization problem in IEEE 802.15.4 cluster-tree networks, so it is difficult to increase the network performance. Therefore, to solve this problem in this paper we study a relay transmission protocol based on the standard protocol in the IEEE 802.15.4 MAC. In the proposed scheme, the coordinators can relay data frames to their parent devices or their children devices without contention and can provide bandwidth for the increased traffic load or the number of devices. We also evaluate the performance of the proposed scheme through simulation. The simulation results demonstrate that the proposed scheme can improve the reliability, the end-to-end delay, and the energy consumption.
Highlights
A wireless sensor network is a kind of new wireless network that transmits sensing data to a destination device
We have proposed a new relay transmission scheme to reduce the transmission delay time and the energy consumption in wireless sensor networks
The proposed scheme can improve the flexibility of the network resource allocation and the network coverage in wireless sensor improve the flexibility of the network resource allocation and the network coverage in wireless sensor networks
Summary
A wireless sensor network is a kind of new wireless network that transmits sensing data to a destination device. Because the existing routing protocols require more processing for multi-hop transmission in the network layer, they consume more energy. The common drawback of the existing approaches is that they do not address the poor bandwidth utilization problem in IEEE 802.15.4 cluster-tree networks, so it is hard to increase the network performance. To solve this problem, we propose new relay transmission scheme to reduce the transmission delay time and the energy consumption in the IEEE 802.15.4 cluster-tree networks. We propose the enhanced beacon scheduling scheme to extend the coverage of wireless sensor networks and to optimize the wireless resource allocation
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