Nonsmooth optimization algorithms for multicast beamforming in content-centric fog radio access networks
This paper considers a content-centric fog radio access network (F-RAN). Its multi-antenna remote radio heads (RRHs) are capable of caching and executing signal processing for content delivery to its users. The fronthaul traffic is thus saved since its baseband processing unit (BBU) needs to transfe...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2021
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| Online Access: | https://hdl.handle.net/10356/154493 |
| _version_ | 1811690393493831680 |
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| author | Nguyen, Huy Tiep Tuan, H. D. Duong, T. Q. Poor, H. V. Hwang, W. J. |
| author2 | School of Computer Science and Engineering |
| author_facet | School of Computer Science and Engineering Nguyen, Huy Tiep Tuan, H. D. Duong, T. Q. Poor, H. V. Hwang, W. J. |
| author_sort | Nguyen, Huy Tiep |
| collection | NTU |
| description | This paper considers a content-centric fog radio access network (F-RAN). Its multi-antenna remote radio heads (RRHs) are capable of caching and executing signal processing for content delivery to its users. The fronthaul traffic is thus saved since its baseband processing unit (BBU) needs to transfer only the cache-missed content items to the RRHs via limited-capacity fronthaul links. The problem of beamforming design maximizing the energy efficiency in content delivery subject to the quality-of-content-service constraints in terms of content throughput and fronthaul limited-capacity is addressed. Unlike the user's throughput in user-centric networks, the content throughput in content-centric networks is no longer a differentiable function of the beamforming vectors. The problem is inherently high-dimensional due to the involvement of many beamforming vectors even in simple cases of three RRHs serving three users. Path-following algorithms, which invoke a simple convex quadratic optimization problem to generate a better feasible point, are proposed for computation of this nonsmooth and high-dimensional optimization problem. We also employ generalized zero-forcing beamforming, which forces the multi-content interference to zero or nearly to zero to reduce the problem dimensionality for computational efficiency. Numerical results are provided to demonstrate their computational effectiveness. They also reveal that when the fronthaul traffic becomes more flexible, hard-transfer fronthauling is more energy efficient than soft-transfer fronthauling. |
| first_indexed | 2024-10-01T06:03:17Z |
| format | Journal Article |
| id | ntu-10356/154493 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:03:17Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1544932021-12-23T07:30:32Z Nonsmooth optimization algorithms for multicast beamforming in content-centric fog radio access networks Nguyen, Huy Tiep Tuan, H. D. Duong, T. Q. Poor, H. V. Hwang, W. J. School of Computer Science and Engineering Engineering::Electrical and electronic engineering Fog Radio Access Network (F-RAN) Multi-Input Single Output (MISO) This paper considers a content-centric fog radio access network (F-RAN). Its multi-antenna remote radio heads (RRHs) are capable of caching and executing signal processing for content delivery to its users. The fronthaul traffic is thus saved since its baseband processing unit (BBU) needs to transfer only the cache-missed content items to the RRHs via limited-capacity fronthaul links. The problem of beamforming design maximizing the energy efficiency in content delivery subject to the quality-of-content-service constraints in terms of content throughput and fronthaul limited-capacity is addressed. Unlike the user's throughput in user-centric networks, the content throughput in content-centric networks is no longer a differentiable function of the beamforming vectors. The problem is inherently high-dimensional due to the involvement of many beamforming vectors even in simple cases of three RRHs serving three users. Path-following algorithms, which invoke a simple convex quadratic optimization problem to generate a better feasible point, are proposed for computation of this nonsmooth and high-dimensional optimization problem. We also employ generalized zero-forcing beamforming, which forces the multi-content interference to zero or nearly to zero to reduce the problem dimensionality for computational efficiency. Numerical results are provided to demonstrate their computational effectiveness. They also reveal that when the fronthaul traffic becomes more flexible, hard-transfer fronthauling is more energy efficient than soft-transfer fronthauling. This work was supported in part by the Institute for Computational Science and Technology, Hochiminh City, Vietnam, in part by the Australian Research Councils’ Discovery Projects under Project DP190102501, in part by the U.K. Royal Academy of Engineering Research Fellowship under Grant RF1415\14\22, in part by the U.S. National Science Foundation under Grant CCF-1908308. 2021-12-23T07:30:32Z 2021-12-23T07:30:32Z 2020 Journal Article Nguyen, H. T., Tuan, H. D., Duong, T. Q., Poor, H. V. & Hwang, W. J. (2020). Nonsmooth optimization algorithms for multicast beamforming in content-centric fog radio access networks. IEEE Transactions On Signal Processing, 68, 1455-1469. https://dx.doi.org/10.1109/TSP.2020.2964250 1053-587X https://hdl.handle.net/10356/154493 10.1109/TSP.2020.2964250 2-s2.0-85082167380 68 1455 1469 en IEEE Transactions on Signal Processing © 2020 IEEE. All rights reserved. |
| spellingShingle | Engineering::Electrical and electronic engineering Fog Radio Access Network (F-RAN) Multi-Input Single Output (MISO) Nguyen, Huy Tiep Tuan, H. D. Duong, T. Q. Poor, H. V. Hwang, W. J. Nonsmooth optimization algorithms for multicast beamforming in content-centric fog radio access networks |
| title | Nonsmooth optimization algorithms for multicast beamforming in content-centric fog radio access networks |
| title_full | Nonsmooth optimization algorithms for multicast beamforming in content-centric fog radio access networks |
| title_fullStr | Nonsmooth optimization algorithms for multicast beamforming in content-centric fog radio access networks |
| title_full_unstemmed | Nonsmooth optimization algorithms for multicast beamforming in content-centric fog radio access networks |
| title_short | Nonsmooth optimization algorithms for multicast beamforming in content-centric fog radio access networks |
| title_sort | nonsmooth optimization algorithms for multicast beamforming in content centric fog radio access networks |
| topic | Engineering::Electrical and electronic engineering Fog Radio Access Network (F-RAN) Multi-Input Single Output (MISO) |
| url | https://hdl.handle.net/10356/154493 |
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