多节点共享保障时隙分配策略

在现代工业无线网络中,IEEE 802.15.4标准以其独特的低功耗、低成本特点被广泛应用。IEEE 802.15.4可以提供最低0.006%的占空比,最大限度降低功耗,同时提供的保障时隙GTS机制为节点提供了实时服务保障。然而,在为大规模节点提供保障时,IEEE 802.15.4提供的GTS机制缺乏灵活性,只能为有限节点提供实时保障服务。本文针对这一问题提出一种多节点共享保障时隙分配策略,允许多个数据流在满足延迟需求前提下,共享同一个GTS减少带宽浪费。分析表明,多节点共享的保障时隙分配策略与普通分配方法相比,可有效提高带宽利用率。

Guaranteed time slots allocation in multi-node wireless sensor networks

With unique characteristics of low power consumption and low cost, IEEE 802.15.4 standard is widely used in the modern industrial wireless networks. It can provide the lowest 0.006% of duty ratio to reduce power consumption, and offer real-time service for the node through the guarantee time slots (GTS) mechanism. However, IEEE 802.15.4 can only provide real-time guarantees service for certain nodes, which is lack of flexibility for large-scale networks. A shared security timeslot allocation policy by multi-node is present for overcome the shorting of special GTS allocation method, taking into account the traffic specifications and the delay requirements of the flows. The policy enables the use of a GTS by multiple nodes, and still ensure delay and bandwidth requirements. Numerical analysis clearly showed that, compared with the traditional method, the improvement of allocation policy can effectively improve the bandwidth utilization.