Dynamic frequency allocation in fractional frequency reused OFDMA networks
Dynamic frequency allocation in fractional frequency reused OFDMA networks
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DOI：
10.1109/twc.2009.081146
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发表时间：
2008-11
影响因子：
10.4
通讯作者：
S. Ali;Victor C. M. Leung
中科院分区：
文献类型：
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作者：
S. Ali;Victor C. M. Leung
提出了一种动态分数频率复用小区结构，简化了多小区OFDMA网络中频率复用的子载波分配问题。该结构将蜂窝表面划分为两个重叠的地理区域，并将子载波正交分配到该区域，这些子载波被称为超级子载波群和规则子载波群。所提出的架构允许频率复用因子为1，减少小区间干扰，增加集群增益，同时满足最低数据速率要求。我们还提出了一种有效的分层解决方案来实现所提出的体系结构。该方案首先将子载波分配给组，使长期性能最大化，然后机会性地为用户调度子载波。考虑到用户的公平性要求，在基站上进行机会调度。仿真结果表明，与传统的频率分配方案相比，该方案的性能有所提高。
This paper proposes a dynamic fractional frequency reused cell architecture that simplifies the problem of subcarrier allocation with frequency reuse in multicell OFDMA networks. The architecture divides the cell surface into two overlapping geographical regions and orthogonally allocates subcarriers, which are called super and regular group of subcarriers, to the regions. The proposed architecture allows a frequency reuse factor of 1 with reduced inter-cell interference and increased trunking gain, while satisfying minimum data rate requirements. We also propose an efficient hierarchical solution to realize the proposed architecture. The solution first allocates subcarriers to the groups so that long term performance is maximized and next opportunistically schedules subcarriers to the users. The opportunistic scheduling is performed at the base stations considering the fairness requirements of the users. Simulation results illustrate the performance improvements of the proposed solution in comparison to the traditional frequency allocation schemes.