北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2021, Vol. 44 ›› Issue (3): 41-46.doi: 10.13190/j.jbupt.2020-190

• 论文 • 上一篇    下一篇

一种优化基站服务状态的C-RAN联合波束设计

郝万明1,2,3, 姚壮1,3, 孙钢灿2,3, 朱政宇2,3, 周一青1,4   

  1. 1. 郑州大学 河南先进技术研究院, 郑州 450003;
    2. 郑州大学 信息工程学院, 郑州 450001;
    3. 郑州大学 产业技术研究院, 郑州 450001;
    4. 中国科学院大学 计算技术研究所, 北京 100049
  • 收稿日期:2020-10-08 出版日期:2021-06-28 发布日期:2021-06-23
  • 通讯作者: 朱政宇(1988-),男,讲师,E-mail:iezyzhu@zzu.edu.cn. E-mail:iezyzhu@zzu.edu.cn
  • 作者简介:郝万明(1988-),男,讲师.
  • 基金资助:
    国家自然科学基金项目(61801434);河南省创新示范专项基金项目(201111212300);郑州市重大科技创新专项基金项目(2019CXZX0037)

A Joint Beamforming Design for Optimizing Service State of Base Station in C-RAN

HAO Wan-ming1,2,3, YAO Zhuang1,3, SUN Gang-can2,3, ZHU Zheng-yu2,3, ZHOU Yi-qing1,4   

  1. 1. Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou 450003, China;
    2. School of Information Engineering, Zhengzhou University, Zhengzhou 450001, China;
    3. Industrial Technology Research Institute, Zhengzhou University, Zhengzhou 450001, China;
    4. Institute of Computing Technology, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2020-10-08 Online:2021-06-28 Published:2021-06-23

摘要: 为实现云无线接入网络(C-RAN)系统低时延数据传输,提出了一种基站缓存和前向链路组播传输模式,通过联合优化前向链路波束和接入链路波束,使系统传输时延最小.采用L0范数逼近、连续凸逼近和半正定松弛技术,将非凸的时延最小化问题转化为凸问题,并提出了一种有效的迭代算法以获得问题的解.不同于传统基于缓存的C-RAN组播传输方案,所提方案可根据基站缓存内容和前向链路信道质量,决定基站的服务状态,即暂停服务和继续服务.仿真结果表明,相比于传统方案,所提方案可有效地降低系统的传输时延.

关键词: 云无线接入网络, 基站缓存, 波束成形, 组播, 凸优化

Abstract: In order to achieve low-latency data transmission in the cloud wireless access network (C-RAN), a base station caching and fronthaul link multicast transmission mode is proposed to minimize the system transmission delay by jointly optimizing fronthaul link beamforming and access link beamforming. The non-convex time delay minimization problem is transformed into a convex one by using L0 norm approximation, successive convex approximation and semi-definite relaxation techniques. An effective iterative algorithm is proposed to obtain the solution of the problem. The proposed scheme can determine the service status of base stations, which are suspended service, continuing service status according to the content cached by base stations and the channel quality of fronthaul link. They are different from the traditional multicast transmission for cache-enabled C-RAN. Simulations show that compared with the traditional scheme, the proposed scheme can effectively reduce the system transmission delay.

Key words: cloud radio access network, base-station caching, beamforming, multicasting, convex optimization

中图分类号: