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Question

IEEE 802.15.4: IEEE 802.15.4 is the proposed standard for low rate wireless personal area networks (LR-WPAN's).IEEE 802.15.4 focuses on low cost of deployment, low complexity, and low power consumption.IEEE 802.15.4 is designed for wireless sensor applications that require short range communication to maximize battery life. The standard allows the formation of the star and peer-to-peer topology for communication between network devices. Devices in the star topology communicate with a central controller while in the peer-to-peer topology ad hoc and self-configuring networks can be formed. IEEE 802.15.4 devices are designed to support the physical and data-link layer protocols. The physical layer supports 868/915 MHz low bands and 2.4 GHz high bands. The MAC layer controls access to the radio channel using the CSMA-CA mechanism. The MAC layer is also responsible for validating frames, frame delivery, network interface, network synchronization, device association, and secure services. Wireless sensor applications using IEEE 802.15.4 include residential, industrial, and environment monitoring, control and automation.

Answer 1

IEEE 802.15.4 是针对低速无线个域网（Low-Rate Wireless Personal Area Network，简写为LR-WPAN）的建议标准。IEEE 802.15.4 重点关注于低成本的系统实现、低复杂度、低功耗。IEEE 820.15.4 主要是面向需要短距离通信、且尽量延长电池使用寿命的无线传感器应用而设计的。该标准允许网络设备之间采用星型拓扑或点对点拓扑。在星型拓扑中，各网络设备与中央控制器进行通讯；而在点对点拓扑中，各节点相互自动组网并自动配置。符合 IEEE 802.15.4 的设备在设计时应支持相关的物理层及数据链路层协议。其中物理层支持868/915 MHz 的低频段以及2.4 GHz 的高频段。MAC层则通过CSMA-CA机制控制对无线信道的访问。MAC层还负责校验帧的有效性、传输帧内容、网络接口、网络同步、设备关联以及安全性服务。采用IEEE 802.15.4的无线传感器应用场合包括住宅、工业、环境监控、过程控制及自动化。

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