Esmaeil Amiri, Ning Wang, M. Shojafar, R. Tafazolli
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引用次数: 7
Abstract
Open radio access network (Open-RAN) is becoming a key component of cellular networks, and therefore optimizing its architecture is vital. The Open-RAN is a distributed architecture that lets the virtualized networking functions be split between Distributed Units (DU) and Centralized Units (CUs); as a result, there is a wide range of design options. We propose an optimization problem to choose the split points. The objective is to balance the load across CUs as well as midhaul links by considering delay requirements. The resulting formulation is an NP-hard problem that is solved with a novel heuristic algorithm. Performance evaluation shows that the gap between optimal and heuristic solutions does not exceed 2%. An in-depth analysis of different centralization levels shows that using multi-CUs could reduce the total bandwidth usage by up to 20%. Moreover, multipath routing can improve the result of load balancing between midhaul links while increasing bandwidth usage.
开放式无线接入网（Open-RAN）正在成为蜂窝网络的关键组成部分，因此优化其架构至关重要。开放式无线接入网是一种分布式架构，可在分布式单元（DU）和集中式单元（CU）之间拆分虚拟化网络功能，因此有多种设计方案可供选择。我们提出了一个选择分割点的优化问题。目标是通过考虑延迟要求，平衡各 CU 和中途链路的负载。由此产生的公式是一个 NP 难问题，可通过一种新颖的启发式算法来解决。性能评估表明，最优解与启发式解之间的差距不超过 2%。对不同集中程度的深入分析表明，使用多 CU 可以将总带宽使用量最多减少 20%。此外，多路径路由可以在提高带宽使用率的同时，改善中途链路之间的负载平衡效果。
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