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Monday, June 23, 2008

为无线传感器网络寻找“杀手级”应用

为无线传感器网络寻找“杀手级”应用

因缺乏利益驱动的杀手级应用,在商用市场中无线传感器网络(WSN)并未得到完全的应用,这是Plextek为英国通信行业规则制定者主导的一份研究报告所得到的结论。

这项为期10个月的委托研究考察了无线传感器网络的技术发展、可能的市场增长远景以及对频谱分配将存在什么暗示。

位于英格兰Great Chesterford的Plextek公司在这项研究上与St Andrews大学以及位于剑桥的一家独立的研究和技术组织TWI合作,他们发现正是传统的传感应用目前在商业上发掘了无线网络传感器的优势。

该研究报告暗示,随着各种系统持续不断地采用现有的免许可频段,包括13.56MHz、433MHz、868MHz以及2.4GHz频段,WSN可能在未来3至5年内开始被更为广泛地部署。对于WSN来说,主要问题在于频段拥挤,特别是具有日益增长应用的2.4GHz Wi-Fi

Ofcom委托的这项研究属于它的“未来无线世界”研发项目的一个组成部分,它研究了未来的通信技术。

“我们的研究得到了一些非常有趣的结论,”Plextek公司的高级顾问Steve Methley表示,“之所以缺乏杀手级应用可能缘于若干限制因素,如现有的无线节点的成本高、最终用户缺乏了解和体验,特别是关于‘真实世界’的可靠性。”

Methley补充说,还需要进一步改善各种电池以及能源净化技术。

Methley表示,“走向杀手级应用的征兆之一可能就是要看看是否包含了主要的系统集成商。如果存在采取专业的方法来定义、安装以及维护真实的无线传感器网络的需求,那么,这样的玩家将越来越多地进入无线传感器网络领域。”

该研究小组还表示,尽管现有的无需许可频谱能够足够地支持WSN,“如果应用急剧增长就可能带来问题。”

该研究报告指出,典型的射频协议,如流行的802.15.4标准被设计为具有一定的频谱裕量,并且在发射之前检查哪些信道是空闲的。当各个频段拥挤在一起时,这可能就会出现问题。802.15.4因其存在频谱裕量而在日益增长的Wi-Fi应用,特别是Wi-Fi流应用中受损。这可能会让WSN看起来不可靠,这是一个特别重要的问题,因为对不可靠性的感觉被认为是影响WSN采用的主要障碍之一。

link: http://www.eetchina.com/ART_8800530699_617687_NT_c8ce0bee.HTM

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