Transmission Rate Maximization in Self-Backhauled Wireless Small Cell Networks

M. Lashgari, B. Maham, W. Saad
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引用次数: 10

Abstract

One key challenge in heterogeneous cellular networks is the presence of wireless backhaul links whose resources must be jointly allocated with those of the radio access network. In this paper, a novel approach for joint backhaul and radio resource allocation in a two-tier small cell network is proposed. The problem is formulated as a Stackelberg game, in which the macrocell base station (MBS) acts as a leader and overlaid picocell base stations (PBSs) as followers. In this game, the MBS maximizes its sum rate transmission by properly allocating the subcarriers over the backhaul links and the PBSs seek to maximize their transmission rate by allocating power and the subcarriers. A self- backhauling model and an orthogonal frequency allocation between the backhaul and the access links are adopted, in which the subcarrier allocation over the backhaul and the access links will be captured in the leader's and followers' optimization problems, respectively. The optimal power allocation problem is studied for the followers problem. Furthermore, the uniqueness of the Stackelberg equilibrium point is investigated. Simulation results show the effectiveness of the proposed algorithm which yields up to 14.2% and 24.9% transmission rate improvement compared to the baseline method.
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自回程无线小蜂窝网络的传输速率最大化
异构蜂窝网络面临的一个关键挑战是无线回程链路的存在,其资源必须与无线接入网的资源共同分配。提出了一种两层小蜂窝网络中联合回传和无线资源分配的新方法。该问题被描述为一个Stackelberg博弈,其中宏蜂窝基站(MBS)作为领导者,覆盖的皮蜂窝基站(PBSs)作为追随者。在此博弈中,MBS通过合理分配回程链路上的子载波来最大化其总速率传输,PBSs通过分配功率和子载波来最大化其传输速率。采用自回程模型和回程与接入链路间的正交频率分配,将回程和接入链路上的子载波分配分别捕获到领导者和追随者的优化问题中。研究了follower问题的最优功率分配问题。进一步研究了Stackelberg平衡点的唯一性。仿真结果表明了该算法的有效性,与基准方法相比,传输速率分别提高了14.2%和24.9%。
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