A survey of cognitive radio handoff schemes, challenges and issues for industrial wireless sensor networks (CR-IWSN)
A survey of cognitive radio handoff schemes, challenges and issues for industrial wireless sensor networks (CR-IWSN)
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DOI：
10.1016/j.jnca.2017.08.016
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发表时间：
2017-11-01
影响因子：
8.7
通讯作者：
Hancke, Gerhard P.
中科院分区：
文献类型：
--
作者：
Oyewobi, Stephen S.;Hancke, Gerhard P.
工业无线传感器网络（IWSN）的应用大多是有时限、关键任务和高度延迟敏感的应用，因此IWSN定义了严格、严格和独特的QoS要求，如及时性、可靠性和可用性。在IWSN中，与其他传感器网络不同，数据包的延迟到达或正在进行的通信的延迟或中断被认为是关键故障。此外，由于IWSN部署在过度拥挤的工业、科学和医疗（ISM）频段，由于在ISM频段运行的其他技术对带宽的激烈竞争，导致用于可靠通信的频谱稀缺和/或正在进行的通信中断，因此很难满足这种独特的QoS要求。然而，认知无线电（CR）通过机会性地使用未使用的许可频谱，同时确保对许可用户的干扰最小，从而提供了更多的频谱机会。同样，频谱切换是认知无线电中的一种新型切换，有可能通过机会性地使用频谱、最小的切换延迟、有效的目标信道选择策略以及有效的链路恢复维护，为iwsn提供更高的带宽、可靠、平滑和无干扰的通信。因此，认知无线电工业无线传感器网络（CR-IWSN）成为近年来研究的热点。在本文中，我们强调并讨论了IWSN的重要QoS要求以及现有IWSN标准为应对这些挑战所做的努力。我们讨论了认知无线电和频谱切换在为iwsn提供实时可靠和平滑通信方面的潜力以及如何发挥作用。
Industrial wireless sensor network (IWSN) applications are mostly time-bound, mission-critical and highly delay sensitive applications therefore IWSN defines strict, stringent and unique QoS requirements such as timeliness, reliability and availability. In IWSN, unlike other sensor networks, late arrival of packets or delay or disruption to an on-going communication are considered as critical failure. Also, because IWSN is deployed in the overcrowded industrial, scientific, and medical (ISM) band it is difficult to meet this unique QoS requirements due to stiff competition for bandwidth from other technologies operating in ISM band resulting in scarcity of spectrum for reliable communication and/or disruption of ongoing communication. However, cognitive radio (CR) provides more spectral opportunities through opportunistic-use of unused licensed spectrum while ensuring minimal interference to licensed users. Similarly, spectrum handoff, which is a new type of handoff in cognitive radio, has the potential to offer increase bandwidth, reliable, smooth and interference-free communication for IWSNs through opportunistic-use of spectrum, minimal switching-delays, and efficient target channel selection strategies as well as effective link recovery maintenance. As a result, a new paradigm known as cognitive radio industrial wireless sensor network (CR-IWSN) has become the interest of recent research efforts. In this paper, we highlight and discuss important QoS requirements of IWSN as well as efforts of existing IWSN standards to address the challenges. We discuss the potential and how cognitive radio and spectrum handoff can be useful in the attempt to provide real-time reliable and smooth communication for IWSNs.