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FITEE
Front. Inform. Technol. Electron. Eng.  2016, Vol. 17 Issue (8): 825-833    DOI: 10.1631/FITEE.1500294
    
A novel resource optimization scheme for multi-cell OFDMA relay network
Ning Du, Fa-sheng Liu
College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, China; Department of Mathematics and Information Engineering, Dongchang College of Liaocheng University, Liaocheng 252000, China
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Abstract  In cellular networks, users communicate with each other through their respective base stations (BSs). Conventionally, users are assumed to be in different cells. BSs serve as decode-and-forward (DF) relay nodes to users. In addition to this type of conventional user, we recognize that there are scenarios users who want to communicate with each other are located in the same cell. This gives rise to the scenario of intra-cell communication. In this case, a BS can behave as a two-way relay to achieve information exchange instead of using conventional DF relay. We consider a multi-cell orthogonal frequency division multiple access (OFDMA) network that comprises these two types of users. We are interested in resource allocation between them. Specifically, we jointly optimize subcarrier assignment, subcarrier pairing, and power allocation to maximize the weighted sum rate. We consider the resource allocation problem at BSs when the end users’ power is fixed. We solve the problem approximately through Lagrange dual decomposition. Simulation results show that the proposed schemes outperform other existing schemes.

Key words： Intra-cell communication      Two-way relay      Subcarrier assignment      Subcarrier pairing     
Received: 10 September 2015      Published: 05 August 2016
CLC:  TN911  
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Cite this article:

Ning Du, Fa-sheng Liu. A novel resource optimization scheme for multi-cell OFDMA relay network. Front. Inform. Technol. Electron. Eng., 2016, 17(8): 825-833.

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http://www.zjujournals.com/xueshu/fitee/10.1631/FITEE.1500294     OR     http://www.zjujournals.com/xueshu/fitee/Y2016/V17/I8/825


一种新颖的多小区正交频分多址中继网络资源优化分配算法

概要：在蜂窝网络中，用户通过各自的基站相互通信，且通常位于不同的小区内。对于用户来说，基站相当于一个解码转发中继节点。除了这种传统的用户之外，我们认为相互之间需要通信的用户还可以位于同一小区内，由此产生小区内通信。在这种情况下，基站可作为双向中继取代传统的解码转发中继，实现信息交换。多小区正交频分多址网络同时包含了这两种类型的用户。其中，资源优化分配是我们的研究重点。特别地，我们联合优化子载波分配、子载波成对和功率分配，从而最大化加权速率。通过拉格朗日对偶分解近似求解在用户功率固定的情况下基站资源的最优化问题。仿真结果表明，本文提出的策略优于现有的策略。

关键词： 小区内通信,  双向中继,  子载波分配,  子载波成对 
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