杨刚,李晓毅,陈谋,谭冕.一种新的紫外光自组织网络的时分多址接入邻居发现算法[J].光电子激光,2015,26(6):1074~1080 |
一种新的紫外光自组织网络的时分多址接入邻居发现算法 |
A new neighbor discovery algorithm of TDMA in UV ad hoc network |
投稿时间:2015-01-07 |
DOI: |
中文关键词: 光通信 紫外光(UV) 自组织网络 时分多址接入(TDMA) 邻居发现 |
英文关键词:optical communication ultraviolet (UV) ad hoc network time division multiple access(TDMA) neighbor discovery |
基金项目:国家自然科学基金(61002034,61471366)、重庆市自然科学基金(cstc2012jjA40023,cstc2014jcyjA40050)和中国博士后科学基金(2014M552318)资助项目 (重庆通信学院 应急通信重点实验室,重庆 400035) |
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中文摘要: |
为了适应大 规模及拓扑变化较快的紫外光(UV)自组织网络,本文以提高邻居发现概率为目的,提出了一 种基于时分多址接入(TDMA, time division multiple access)的UV定向邻居发现新算法。新算法在DTRA(directional transmission and reception algorithm)协议的基础上采用了退避时延机制, 并通过邻居判断和维护机制让节点快速更新本地邻居表。实验结果表明,新 算法充分考虑了UV大气传输特性,能够有效地解决节点冲突问题,并通过找到一个最佳退避 时延使得节点冲突 概率和邻居发现时延之间达到一个较好的平衡。 |
英文摘要: |
Ultraviolet (UV) spectrum has unique properties in the atmospheric tra nsmission channel,which makes a big difference in neighbor discovery algorithm design between UV and radio frequency (RF) light.Despite significant research effort on the UV physical layer,the study on neighbor disco very algorithm design at MAC layer is quite rare.In this paper,a UV directional neighbor discovery algorithm based on time division multiple access (TDMA) is proposed to adapt to the large-scale UV ad hoc network with rapid cha nges in topology.In addition to the directional transmission and reception algorithm (DTRA) as a basis,our appr oach also uses a backoff delay mechanism to avoid node conflict,and introduces a local neighbor table by neighbor judgment and maintain mechanisms to improve the adaptability of neighbor discovery process for fast no de mobility.The performances of the new and traditional algorithms are compared by simulations.The node d iscovery propability of the new algorithm is theoretically analyzed under different node speeds and backoff dela ys.Experimental results show that fully considering the characteristics of UV atmospheric transmission,the proposed algorithm can solve the problem of node conflict effectively and achieve a preferable trade-off between collision probability and neighbor discovery delay.Specifically,it can raise 45% in the node discovery propabilit y,and raise another 5% in the node discovery propability through finding an optimal backoff delay. |
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