ISSN 1000-1239 CN 11-1777/TP

计算机研究与发展 ›› 2020, Vol. 57 ›› Issue (7): 1393-1403.doi: 10.7544/issn1000-1239.2020.20190269

• 网络技术 • 上一篇    下一篇

基于能量采集的分布式时分多址协议

徐娟,张茸,阚佳丽,张妍   

  1. (同济大学电子与信息工程学院 上海 201804) (jxujuan@tongji.edu.cn)
  • 出版日期: 2020-07-01
  • 基金资助: 
    国家自然科学基金项目(61202384);中央高校基本科研业务费专项资金(221201700186)

Distributed Time Division Multiple Access Protocol Based on Energy Harvesting

Xu Juan, Zhang Rong, Kan Jiali, Zhang Yan   

  1. (College of Electronics and Information Engineering, Tongji University, Shanghai 201804)
  • Online: 2020-07-01
  • Supported by: 
    This work was supported by the National Natural Science Foundation of China (61202384) and the Fundamental Research Funds for the Central Universities (221201700186).

摘要: 纳米节点利用太赫兹通信能获得极高的传输速率,节点间的通信以及协调访问太赫兹信道都需要媒质接入控制(medium access control, MAC)协议.由于太赫兹信道的分子吸收噪声和纳米设备资源受限等特性,经典的MAC协议已不再适用.针对基于时域扩展开关键控(time spread on-off keying, TS-OOK)的太赫兹传感器网络的数据传输存在连续碰撞的问题以及纳米节点能量非常有限的问题,提出一种基于能量采集的分布式时分多址协议(distributed energy harvesting-based time division multiple access, DEH-TDMA).该协议引入压电式纳米能量采集系统,首先将纳米节点剩余能量和缓存区的数据包数量作为状态信息构建Markov决策过程模型,并根据节点的数据包传输量和能耗来设计收益函数,然后求解出最优策略,最终纳米节点根据自身状态和最优策略动态接入信道.仿真结果表明该协议在延长网络生命周期方面存在优势.

关键词: 纳米网, 太赫兹带, 媒质接入控制, 时分多址, 能量采集

Abstract: Terahertz wireless nanosensor networks (WNSNs) are novel networks interconnecting multiple nano-devices by means of wireless communication. Nanosensors can obtain ultra-high-speed transmission rates using communications in the terahertz band, and medium access control (MAC) protocols play an important role in regulating the access to the terahertz channel and coordinating transmission orders among nanosensors. However, classical MAC protocols are not applicable due to the existing molecular absorption noise in terahertz channel and the very limited energy of nanodevices. In this paper, a distributed energy harvesting-based time division multiple access (DEH-TDMA) protocol is proposed, which aims to overcome the energy limitations of nanosensors and the catastrophic collisions in terahertz WNSNs based on a modulation scheme called time spread on-off keying (TS-OOK). The protocol adopts the piezoelectric energy harvesting system, where a Markov decision process (MDP) model is firstly constructed by considering the remaining energy and the number of packets in the buffer as state information, then the number of transmitted packets and the energy consumption are considered as impacting factors in designing the reward function of MDP model, so each nanosensor can dynamically access the channel according to its own state after solving an optimal strategy. Simulation results show that DEH-TDMA has advantages in extending the network life cycle.

Key words: nanonetworks, terahertz band, medium access control, time division multiple access, energy harvesting

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