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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。
In cellular networks, users communicate with each other through their respective base stations and are usually located in different cells. For the user, the base station is equivalent to a decoding and forwarding relay node. In addition to this traditional user, we think users who need to communicate with each other may also be located in the same cell, thereby generating intra-cell communications. In this case, the base station can serve as a two-way relay instead of the traditional decoding and forwarding relay, to achieve information exchange. Multi-cell Orthogonal Frequency Division Multiple Access networks contain both types of users. Among them, the optimal allocation of resources is our research focus. In particular, we jointly optimize subcarrier allocation, subcarrier pairing, and power allocation to maximize the weighted rate. Through Lagrange dual decomposition approximation to solve the problem of optimization of base station resources in the case of fixed power users. Simulation results show that the proposed strategy is superior to the existing strategy.