分布式小基站资源分配优化方法

Resource allocation and optimization for distributed small base stations

在小基站和宏基站联合部署的异构网络中,相邻小基站之间的干扰现象较为严重,导致系统性能下降。文中针对OFDMA系统中分布式基站架构,提出频率复用和图论知识相结合的改进型干扰消除方案,结合业务需求和频带资源,遵循相邻小基站之间使用正交子信道的原则,合理地将子信道分配给小基站,使小基站之间复用的子信道数目更多。文中还研究了异构场景下宏基站辅助带宽的方法,由于宏基站和小基站采用相同的频带资源,可将宏基站的小部分带宽分配给业务需求得不到满足的小基站内的用户。仿真结果证明,在干扰减少的同时,系统吞吐量和小基站的满意度都得到了提高。

In heterogeneous networks of joint deployment in small and macro cells, the interference be- tween adjacent cells is quite serious, leading to the degradation of system performance. Based on the dis- tributed base station structure in the OFDMA system, an improved method for interference elimination in combination with the frequency multiplexing and the graph theory is proposed. In the method, sub chan- nels are allocated to small cells in a proper way, coupled with service requirements as well as frequency resources, following the principle that adjacent small cells utilize orthogonal sub channels, so as to make more sub channels reusable between adjacent small ceils. Moreover, a scheme for macro-cell supplemen- tary band is put forward under the circumstances of heterogeneous networks. Since the macro-cell and small cells use the same frequency resources, a small part of macro-cell bands can be allocated to the us- ers in small cells if those requirements are not met. Simulation results demonstrate that the system throughput performance can be enhanced by reducing the interference, and the satisfaction level of small cells users can be improved.