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针对在LTE-A(long-term evolution-advanced)上行蜂窝链路与设备直通(deviceto-device,D2D)链路间的同频干扰问题,联合功率控制和信道分配最大化系统频带利用率,同时保证已有蜂窝链路的服务质量需求.此外模型中假设单条D2D链路容许复用多条连续的信道资源.考虑到原问题的复杂性,将其分解为功率控制和信道分配两部分:其中,功率控制部分可借助凸优化分析,而在上述最优解的基础上,信道分配部分等价于经典的集合划分问题,一般意义下为NP-hard(nondeterministic polynomial-time hard)难题,继而设计了一种多项式时间复杂度的贪婪算法来实现性能与复杂度之间的折中.仿真结果表明,所提联合资源优化方案优于单一资源优化方案以及单D2D链路仅能复用单信道的联合资源优化方案,而且其性能接近由分支界限法得到的全局最优解.
In view of the co-channel interference problem between LTE-A long-term evolution-advanced uplink (deviceto-device) links and D2D links, joint power control and channel allocation maximize system bandwidth utilization, meanwhile, In addition, it is assumed in the model that a single D2D link allows multiplexing of multiple continuous channel resources. Considering the complexity of the original problem, it is decomposed into two parts: power control and channel allocation , The power control part can be based on convex optimization analysis. On the basis of the above optimal solution, the channel assignment part is equivalent to the classic set division problem, which is generally NP-hard (nondeterministic polynomial-time hard), and then designed A greedy algorithm of polynomial time complexity is proposed to achieve the compromise between performance and complexity.The simulation results show that the proposed joint resource optimization scheme is superior to the single resource optimization scheme and the single D2D link can only reuse single channel Joint resource optimization scheme, and its performance is close to the global optimal solution obtained by the branch and bound method.