Abstract: The cell range expansion technique in the heterogeneous network reduces the macrocell load while causing the serious cross layer interference. The paper presents a dynamic resource allocation scheme to reduce the interference in the network and improve system spectrum efficiency. This scheme balances the load of two-layer network through setting coefficient and enhances the spectral efficiency by adjusting the spectrum resources dynamically under the circumstance of eliminating the cross layer interference. The simulation results suggest that this scheme compared with the existing schemes effectively reduces the interference of picocells, improves the overall spectrum efficiency of the system, and balances the load of two-layer network while the stability of the macrocell is obtained.

Key words: heterogeneous network, cell range expansion, interference coordination, spectral resource allocation, spectral efficiency

摘要： 两层异构网络中小区增强技术在减轻宏小区负载同时也引起严重跨层干扰问题。针对增强小区跨层干扰问题，提出一种动态资源分配调度方案，以减小系统干扰提高系统频谱效率为目的，通过设定校验系数，平衡两层网络负载；通过动态调整增强小区专用频谱资源比例，在降低跨层干扰情况下，提高了资源利用率。仿真结果表明，与现有方案相比，所提方案在保证宏小区性能稳定的同时，有效地减少了微微小区跨层干扰，提高系统总频谱效率，两层网络负载得到平衡。

关键词: 异构网络, 小区增强, 干扰协调, 频谱资源分配, 频谱效率