低轨卫星物联网多址接入方式研究
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摘要
物联网的出现深刻影响了人们的生活和工作方式,但是地面物联网的覆盖范围十分有限,而低轨卫星物联网作为地面物联网的延伸和补充,具有覆盖范围广,单一波束下用户数多等特点,很好地解决了地面物联网的不足。然而,解决海量用户终端接入,并保证其信息传输的可靠性和时效性是必须要解决的问题。因此,需要针对低轨卫星通信的特点,设计一种面向物联网海量连接的高效可靠的多址接入协议。通过研究分析现有的基于争用解决的分集时隙ALOHA(CRDSA)多址接入协议,针对低轨卫星物联网的工作特点提出了一种改进的多址接入方法,并在该方法的基础上,加入了终端有数据包发送的概率、增大了终端数和终端发送数据包的随机性。理论分析和仿真结果证明了所设计方法的有效性。
The emergence of the Internet of Things(IoT) has a profound impact on people's lives and working. However,the coverage of ground IoT is limited. As an extension and supplement of the ground IoT,the IoT of low-orbit satellites has a wide coverage and a large number of users under a single beam,which well solves the shortcomings of the ground IoT. However,it is necessary to solve the problem of mass user terminal access and ensure the reliability and timeliness of its information transmission. Therefore,aiming at the characteristics of LEO satellite communication,an efficient and reliable multiple access protocol for mass connection of IoT must be designed. By researching and analyzing the existing multiple access protocol of contention resolution diversity slotted ALOHA(CRDSA),we design an improved multiple access method for the work characteristics of the IoT. On the basis,the probability of sending packets,the number of terminals and the randomicity of packets sent by terminals are added. Theoretical analysis and simulation results have demonstrated the effectiveness of the proposed method.
The emergence of the Internet of Things(IoT) has a profound impact on people's lives and working. However,the coverage of ground IoT is limited. As an extension and supplement of the ground IoT,the IoT of low-orbit satellites has a wide coverage and a large number of users under a single beam,which well solves the shortcomings of the ground IoT. However,it is necessary to solve the problem of mass user terminal access and ensure the reliability and timeliness of its information transmission. Therefore,aiming at the characteristics of LEO satellite communication,an efficient and reliable multiple access protocol for mass connection of IoT must be designed. By researching and analyzing the existing multiple access protocol of contention resolution diversity slotted ALOHA(CRDSA),we design an improved multiple access method for the work characteristics of the IoT. On the basis,the probability of sending packets,the number of terminals and the randomicity of packets sent by terminals are added. Theoretical analysis and simulation results have demonstrated the effectiveness of the proposed method.
引文
[1] 王献斌.低复杂度大规模接入协议设计[D].杭州:浙江大学,2017.
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[17] 贺瑶,王文庆,薛飞.基于云计算的海量数据挖掘研究[J].计算机技术与发展,2013,23(2):69-72.
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[19] 杨柳,范平志,郝莉.基于捕获与退避的多信道时隙ALOHA协议性能分析[J].西南交通大学学报,2013,48(4):761-768.
[2] 黄飞.低轨卫星通信接入与切换策略研究[D].成都:电子科技大学,2009.
[3] ANDREWS J G,BUZZI S,CHOI W,et al.What will 5G be[J].IEEE Journal on Selected Areas in Communications,2014,32(6):1065-1082.
[4] DEL RIO HERRERO O,DE GAUDENZI R.A high-performance MAC protocol for consumer broadband satellite systems[C]//Proceedings of 27th AIAA international communications satellite systems conference.Edinburgh,United Kingdom:AIAA,2009:512-513.
[5] HASAN M,HOSSAIN E,NIYATO D.Random access for machine-to-machine communication in LTE-advanced networks:issues and approaches[J].IEEE Communications Magazine,2013,51(6):86-93.
[6] 张淼科.卫星通信MAC协议的发展研究[J].中国科技信息,2010(17):60-62.
[7] 史长琼,肖瑞强,吴丹.改进的动态帧时隙ALOHA防碰撞算法[J].计算机工程与设计,2014,35(6):1897-1900.
[8] CASINI E,DE GAUDENZI R,DEL RIO HERRERO O.Contention resolution diversity slotted ALOHA (CRDSA):an enhanced random access scheme for satellite access packet networks[J].IEEE Transactions on Wireless Communications,2007,6(4):1408-1419.
[9] 高倩,张更新.低轨卫星物联网多址接入协议研究[J].通信技术,2018,51(3):588-592.
[10] DE GAUDENZI R,HERRERO O D.Advances in random access protocols for satellite networks[C]//2009 international workshop on satellite and space communications.Tuscany,Italy:IEEE,2009:331-336.
[11] LIVA G.Graph-based analysis and optimization of contention resolution diversity slotted ALOHA[J].IEEE Transactions on Communications,2010,59(2):477-487.
[12] BACCO M,GOTTA A,ROSETI C,et al.A study on TCP error recovery interaction with random access satellite schemes[C]//2014 7th advanced satellite multimedia systems conference and the 13th signal processing for space communications workshop.Livorno,Italy:IEEE,2014:405-410.
[13] 李文锋,符修文.无线传感器网络抗毁性[J].计算机学报,2015,38(3):625-647.
[14] 王振杰,王强民,杨小玲.基于移动云交换的智能IoT系统[J].计算机技术与发展,2018,28(10):199-204.
[15] KAWAMOTO Y,NISHIYAMA H,FADLULLAH Z M,et al.Effective data collection via satellite-routed sensor system (SRSS) to realize global-scaled internet of things[J].IEEE Sensors Journal,2013,13(10):3645-3654.
[16] QU Zhicheng,ZHANG Gengxin,CAO Haotong,et al.LEO satellite constellation for internet of things[J].IEEE Access,2017,5:18391-18401.
[17] 贺瑶,王文庆,薛飞.基于云计算的海量数据挖掘研究[J].计算机技术与发展,2013,23(2):69-72.
[18] 卜俊芳.基于正态分布3σ原则的直觉语言随机多准则决策方法[J].现代商贸工业,2011(24):308.
[19] 杨柳,范平志,郝莉.基于捕获与退避的多信道时隙ALOHA协议性能分析[J].西南交通大学学报,2013,48(4):761-768.