| 基于优先级策略的跨层优化NPLC CSMA/CA机制 | |
| 刘雯静 ; 郭静波 ; LIU Wenjing ; GUO Jingbo | |
| 2016-03-30 ; 2016-03-30 | |
| 关键词 | 信噪比多样性 跨层优化 优先级调度 窄带电力线通信载波侦听多路访问/冲突避免 变包长随机传输 wind farm power distribution transformer selection method TM76 TM73 |
| 其他题名 | Priority-based cross-layer CSMA/CA for narrowband power line communications |
| 中文摘要 | 窄带电力线通信(NPLC)物理层和介质访问控制(MAC)层特性是影响NPLC系统整体性能的关键。针对目前NPLC接入机制与应用需求和信道环境相对分离的问题,该文基于NPLC典型工业应用及其物理层和MAC层关键技术特征,提出一种基于优先级策略的跨层优化NPLC载波侦听多路访问/冲突避免(CSMA/CA)机制。该机制利用动态资源管理(DRM)技术中给出的调制方式和可用子载波信息,对网络节点的退避计数器步长进行动态调整,以充分挖掘信噪比多样性所带来的网络传输速率增益;同时针对典型的NPLC服务业务需求,在跨层CSMA/CA中引入两级优先级调度,使网络中有突发业务到来时高优先级数据包能获得较高的信道接入机会。在实际信道约束下,DRM使物理层的传输包长随机变化,即形成变包长随机传输环境。在该环境下对提出的CSMA/CA机制进行仿真验证。结果表明:该机制能显著提高NPLC系统的传输速率,且跨层步长的调整不会给系统带来任何公平性或丢包率损失;当网络的数据传输规模增大时,高优先级数据包的传输性能可优先得到保障。; The performance of narrowband power line communications(NPLC)is closely related to the physical(PHY)layer and the media access control(MAC)layer.However,current analyses of the NPLC MAC access mechanism isolate the MAC layer and ignored the relationship between the industrial environment and the transmission efficiency.This paper presents a priority-based cross layer optimized CSMA/CA that removes this assumption and considers the key technical characteristics of the NPLC system.Information from the dynamic resources management(DRM)system is used to adjust the backoff counter to improve the system rate gain for various SNR.Priority resolution is added to provide high access probability for urgent data in a sudden high priority service process.Simulations in random transmission environments with variable packet lengths show that this CSMA/CA increases the system speed with no loss of network fairness and no increase in the packet loss rate,with the high priority data transmit speed guaranteed in heavy traffic. |
| 语种 | 中文 ; 中文 |
| 内容类型 | 期刊论文 |
| 源URL | [http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/142636]  |
| 专题 | 清华大学 |
| 推荐引用方式 GB/T 7714 | 刘雯静,郭静波,LIU Wenjing,等. 基于优先级策略的跨层优化NPLC CSMA/CA机制[J],2016, 2016. |
| APA | 刘雯静,郭静波,LIU Wenjing,&GUO Jingbo.(2016).基于优先级策略的跨层优化NPLC CSMA/CA机制.. |
| MLA | 刘雯静,et al."基于优先级策略的跨层优化NPLC CSMA/CA机制".(2016). |
| 个性服务 |
| 查看访问统计 |
| 相关权益政策 |
| 暂无数据 |
| 收藏/分享 |
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
修改评论