Adaptive Block-Level Resource Allocation in OFDMA Networks
Adaptive Block-Level Resource Allocation in OFDMA Networks
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DOI：
10.1109/icccn.2011.6005742
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发表时间：
2011-08
期刊：
影响因子：
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通讯作者：
Jiancun Fan;Qinye Yin;Geoffrey Y. Li;B. Peng;Xiaolong Zhu
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文献类型：
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作者：
Jiancun Fan;Qinye Yin;Geoffrey Y. Li;B. Peng;Xiaolong Zhu
本文研究了正交频分多址（OFDMA）网络下行传输中的自适应资源分配问题。为了使网络的总吞吐量最大化，提出了一种块级资源分配方案。我们专注于长期演进（LTE）系统中的应用，其中分配给同一用户的所有资源块（RB）必须使用相同的调制和编码方案（MCS）。这类优化问题的复杂性通常很高。为了降低复杂度，我们将原优化问题分为两个次优问题。我们首先为信道质量最好的用户分配合适的RB，然后进行功率分配。最后，选择了一种更有效的MCS，既保证了信道条件较差的RB的误码率性能，又充分利用了信道条件较好的RB的误码率。仿真结果表明，当用户数为4、信噪比为10 dB时，所提出的资源分配方案比现有方案的网络总吞吐量提高了20%。
In this paper, we investigate adaptive resource allocation in downlink transmission of orthogonal frequency division multiple access (OFDMA) networks. A block-level resource allocation scheme is developed to maximize the overall throughput of the networks. We focus on application in long term evolution (LTE) systems where all resource blocks (RB's) allocated to the same user must use the same modulation and coding scheme (MCS). The complexity of such optimization problem is usually high. In order to reduce the complexity, we divide the original optimization problem into two suboptimal ones. We first allocate appropriate RB's to users with the best channel quality and then perform power allocation. Finally, a more effective MCS is selected, which not only ensures block-error rate (BLER) performance of RB with the poor channel condition but also makes full use of the RB's with good channel condition. Simulation results show that the proposed resource allocation scheme can improve the overall throughput of the network by 20% compared with the existing scheme when the number of users is 4 and SINR = 10 dB.