Layered Inter-Cluster Cooperation Scheme for Backhaul-Constrained C-RAN Uplink Systems in the Presence of Inter-Cluster Interference
Despite the potential benefits of reducing system costs and improving spectral efficiency, it is challenging to implement cloud radio access network (C-RAN) systems due to the performance degradation caused by finite-capacity fronthaul links and inter-cluster interference signals. This work studies...
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MDPI AG
2020-05-01
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| Series: | Entropy |
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| Online Access: | https://www.mdpi.com/1099-4300/22/5/554 |
| _version_ | 1797567879134052352 |
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| author | Junbeom Kim Seok-Hwan Park |
| author_facet | Junbeom Kim Seok-Hwan Park |
| author_sort | Junbeom Kim |
| collection | DOAJ |
| description | Despite the potential benefits of reducing system costs and improving spectral efficiency, it is challenging to implement cloud radio access network (C-RAN) systems due to the performance degradation caused by finite-capacity fronthaul links and inter-cluster interference signals. This work studies inter-cluster cooperative reception for the uplink of a two-cluster C-RAN system, where two nearby clusters interfere with each other on the uplink access channel. The radio units (RUs) of two clusters forward quantized and compressed version of the uplink received signals to the serving baseband processing units (BBUs) via finite-capacity fronthaul links. The BBUs of the clusters exchange the received fronthaul signals via finite-capacity backhaul links with the purpose of mitigating inter-cluster interference signals. Optimization of conventional cooperation scheme, in which each RU produces a single quantized signal, requires an exhaustive discrete search of exponentially increasing search size with respect to the number of RUs. To resolve this issue, we propose an improved inter-BBU, or inter-cluster, cooperation strategy based on layered compression, where each RU produces two descriptions, of which only one description is forwarded to the neighboring BBU on the backhaul links. We discuss the optimization of the proposed inter-cluster cooperation scheme, and validate the performance gains of the proposed scheme via numerical results. |
| first_indexed | 2024-03-10T19:48:39Z |
| format | Article |
| id | doaj.art-662f5f2b69724c7abe2cec545fdb7cf5 |
| institution | Directory Open Access Journal |
| issn | 1099-4300 |
| language | English |
| last_indexed | 2024-03-10T19:48:39Z |
| publishDate | 2020-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Entropy |
| spelling | doaj.art-662f5f2b69724c7abe2cec545fdb7cf52023-11-20T00:33:58ZengMDPI AGEntropy1099-43002020-05-0122555410.3390/e22050554Layered Inter-Cluster Cooperation Scheme for Backhaul-Constrained C-RAN Uplink Systems in the Presence of Inter-Cluster InterferenceJunbeom Kim0Seok-Hwan Park1Division of Electronic Engineering, Jeonbuk National University, Jeonju 54896, KoreaDivision of Electronic Engineering, Jeonbuk National University, Jeonju 54896, KoreaDespite the potential benefits of reducing system costs and improving spectral efficiency, it is challenging to implement cloud radio access network (C-RAN) systems due to the performance degradation caused by finite-capacity fronthaul links and inter-cluster interference signals. This work studies inter-cluster cooperative reception for the uplink of a two-cluster C-RAN system, where two nearby clusters interfere with each other on the uplink access channel. The radio units (RUs) of two clusters forward quantized and compressed version of the uplink received signals to the serving baseband processing units (BBUs) via finite-capacity fronthaul links. The BBUs of the clusters exchange the received fronthaul signals via finite-capacity backhaul links with the purpose of mitigating inter-cluster interference signals. Optimization of conventional cooperation scheme, in which each RU produces a single quantized signal, requires an exhaustive discrete search of exponentially increasing search size with respect to the number of RUs. To resolve this issue, we propose an improved inter-BBU, or inter-cluster, cooperation strategy based on layered compression, where each RU produces two descriptions, of which only one description is forwarded to the neighboring BBU on the backhaul links. We discuss the optimization of the proposed inter-cluster cooperation scheme, and validate the performance gains of the proposed scheme via numerical results.https://www.mdpi.com/1099-4300/22/5/554C-RANinter-cluster cooperationconstrained fronthaul/backhaullayered compression |
| spellingShingle | Junbeom Kim Seok-Hwan Park Layered Inter-Cluster Cooperation Scheme for Backhaul-Constrained C-RAN Uplink Systems in the Presence of Inter-Cluster Interference Entropy C-RAN inter-cluster cooperation constrained fronthaul/backhaul layered compression |
| title | Layered Inter-Cluster Cooperation Scheme for Backhaul-Constrained C-RAN Uplink Systems in the Presence of Inter-Cluster Interference |
| title_full | Layered Inter-Cluster Cooperation Scheme for Backhaul-Constrained C-RAN Uplink Systems in the Presence of Inter-Cluster Interference |
| title_fullStr | Layered Inter-Cluster Cooperation Scheme for Backhaul-Constrained C-RAN Uplink Systems in the Presence of Inter-Cluster Interference |
| title_full_unstemmed | Layered Inter-Cluster Cooperation Scheme for Backhaul-Constrained C-RAN Uplink Systems in the Presence of Inter-Cluster Interference |
| title_short | Layered Inter-Cluster Cooperation Scheme for Backhaul-Constrained C-RAN Uplink Systems in the Presence of Inter-Cluster Interference |
| title_sort | layered inter cluster cooperation scheme for backhaul constrained c ran uplink systems in the presence of inter cluster interference |
| topic | C-RAN inter-cluster cooperation constrained fronthaul/backhaul layered compression |
| url | https://www.mdpi.com/1099-4300/22/5/554 |
| work_keys_str_mv | AT junbeomkim layeredinterclustercooperationschemeforbackhaulconstrainedcranuplinksystemsinthepresenceofinterclusterinterference AT seokhwanpark layeredinterclustercooperationschemeforbackhaulconstrainedcranuplinksystemsinthepresenceofinterclusterinterference |