Centralized vs Distributed Resource Allocation in Multi-Cell OFDMA Systems
Centralized vs Distributed Resource Allocation in Multi-Cell OFDMA Systems
复制标题
多小区 OFDMA 系统中的集中式资源分配与分布式资源分配
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
A. Pérez
中科院分区：
文献类型：
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作者：
Sergio Cicalò;V. Tralli;A. Pérez
具有小区间干扰协调（ICIC）的无线电资源管理是针对诸如长期演进（LTE）的下一代无线系统正在研究的关键问题。虽然集中式资源分配（RA）和协作处理可以最佳地执行ICIC，整体所需的复杂性建议分布式技术的考虑。在本文中，我们提出并比较了一个集中的RA策略，旨在最大限度地提高一个多小区集群系统中存在的功率和公平性约束的总和速率，和一个分布式的RA策略，小区间干扰部分协调通过功率规划方案与预先分配的功率（一个例子是分数频率复用）。分布式RA策略降低了信令和反馈要求，保持了小区内的公平性，并与负载均衡算法联合工作以支持小区间公平性。我们的结果表明，积极的频率复用的分布式RA是能够接近集中式RA的性能时，用户数量很大，同时保持相同的公平性水平。
Radio Resource Management with Inter-cell Interference Coordination (ICIC), is a key issue under investigation for next generation wireless systems such as Long Term Evolution (LTE). Although centralized resource allocation (RA) and collaborative processing can optimally perform ICIC, the overall required complexity suggests the consideration of distributed techniques. In this paper we propose and compare a centralized RA strategy aimed at maximizing the sum-rate of a multi-cell clustered system in presence of power and fairness constraints, and a distributed RA strategy where inter-cell interference is partially coordinated through power planning schemes with preassigned power (an example is fractional frequency reuse). The distributed RA strategy reduces both signaling and feedback requirements, preserves intra-cell fairness and jointly works with a load balancing algorithm to support inter-cell fairness. We show in the results that the distributed RA with aggressive frequency reuse is able to approach the performance of the centralized RA when the number of users is large, while preserving the same level of fairness.