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针对智能用电交互业务需求及低压PLC网络信道特征,提出一种面向智能用电交互业务的多频PLC MAC协议功能。采用基于前导序列的频率认知机制为处于不同位置处链路选择不同的通信频率,可应对PLC信道的频率选择性和“因地为主,因时为辅”的变化规律,提高节点接入率、接入速度和网络可靠性。针对智能用电交互业务需求,采用轮询和CSMA/CA相结合的传输媒质共享方式,支持由从站发起的业务,提高媒体利用率。最后,基于开源网络仿真工具NS-3搭建了面向智能用电交互业务的多频PLC MAC协议仿真平台,可实现工作频率配置及展示、节点接入率、MAC层吞吐量和应用层吞吐量及时延等性能的统计。
In view of the demand of intelligent interactive service and the characteristics of low-voltage PLC network, a multi-frequency PLC MAC protocol function for intelligent interactive service is proposed. Adopting the frequency-based cognitive mechanism based on the preamble sequence to select different communication frequencies for the links at different locations, the frequency selectivity of the PLC channel and the variation rule of “due to the earth and the supplementation of the time” can be used to improve the node Access rate, access speed and network reliability. According to the demand of interactive service of intelligent power consumption, the transmission medium sharing mode combining polling and CSMA / CA is adopted to support the service initiated by the slaves and improve the media utilization. Finally, based on the open source network simulation tool NS-3, a multi-frequency PLC MAC protocol simulation platform for intelligent interactive service is set up, which can realize the working frequency configuration and display, node access rate, MAC layer throughput and application layer throughput in time Delay and other performance statistics.