In milimeter wave heterogenous networks with integrated access and backhaul (mABHetNets), a considerable part of spectrum resources are occupied by the backhaul link, which limits the performance of the access link. In order to overcome such backhaul "spectrum occupancy", we introduce cache in mABHetNets. Caching popular files at small base stations (SBSs) can offload the backhaul traffic and transfer spectrum from the backhaul link to the access link. To achieve the optimal performance of the cache-enabled mABHetNets, we first analyze the signal-to-interference-plus-noise ratio (SINR) distribution and derive the average potential throughput (APT) expression by stochastic geometric tools. Then, based on our analytical work, we formulate a joint optimization problem of cache decision and spectrum partition to maximize the APT. Inspired by the block coordinate descent (BCD) method, we propose a joint cache decision, spectrum partition and power allocation (JCSPA) algorithm to find the optimal solution. Simulation results show the convergence and enhancement of the proposed algorithm. Besides, we verify the APT under different parameters and find that the introduction of cache facilitates the transfer of backhaul spectrum to access link. Jointly deploying appropriate caching capacity at SBSs and performing specified spectrum partition can bring up about 90% APT gain in mABHetNets.
翻译:在有综合存取和回路(mABHetNets)的米利米特波热网络中,相当一部分频谱资源被反光链路占用,这限制了访问链接的性能。为了克服这种反光“频谱占用”,我们在 mABHetNets 中引入缓冲。小型基地站(SBS)的封存流行文件可以卸载回流流流量和从回流连接到访问链接的传输频谱。为了实现缓存驱动的 mABHetNet 算法的最佳性能,我们首先分析信号对干涉加音频路比(SINR)的分布,并用随机偏差的几何工具得出平均吞吐量(APT)的表达方式。然后,根据我们的分析工作,我们制定了一个缓存决定和频谱分区隔断的联合优化问题,以便最大限度地使用APT(BC)方法,我们提出一个联合缓存决定、频谱分区隔断和权力分配(JCSPA)算法,以找到最佳解决办法。模拟结果显示SPT90级(S)的拟议缓存后递增速度连接。此外,我们核查了SPTAPT)在部署联合存能力中找到适当的缓存能力的适当连接。