异构网中基于改进蝙蝠算法的动态CRE偏置选择
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摘要
Macrocell和Femtocell的两层蜂窝网络中的用户位置在空间和时间上具有很大的随机性,给资源分配和干扰管理带来许多挑战。为了适应这种随机性的资源分配,提高同频组网中下行异构蜂窝网络的小区边缘用户的通信速率,更好地实现负载均衡效果,提出了一种基于改进蝙蝠算法来实时动态设置Femtocell小区范围扩展偏置值(CRE)的方案,来缓解宏基站高热点负载压力,提高网络容量,从而用户合理选择接入不同基站,使功率资源得到合理利用,达到负载均衡的目的。仿真结果表明,与现有方案相比,该方案在保证Macrocell通信性能的情况下,提高了小区边缘数据速率及能效,实现了更好的负载均分效果。
The location of users in a two-tier cellular network including Macrocell and Femtocell is very random in the space domain and the time domain, which brings many challenges to resource allocation and interference management. To adapt to this random resource allocation, improve the communication speed of the cell edge users of the downlink heterogeneous cellular network in the same-frequency networking, and achieve a better load balancing effect, an improved bat algorithm is proposed to dynamically set the Femtocell Cell Range Expansion(CRE) offset value in real time, The scheme is used to relieve the high hot spot load pressure of the macro base station and incr-ease the network capacity, so that the user can reasonably choose to access different base stations, and the power resources can be reasonably used to achieve load balancing. The simulation results show that compared with the existing schemes, the proposed scheme improves the cell edge data rate and the energy efficiency, and achieves a better load sharing effect under the condition of Macrocell communication performance.
The location of users in a two-tier cellular network including Macrocell and Femtocell is very random in the space domain and the time domain, which brings many challenges to resource allocation and interference management. To adapt to this random resource allocation, improve the communication speed of the cell edge users of the downlink heterogeneous cellular network in the same-frequency networking, and achieve a better load balancing effect, an improved bat algorithm is proposed to dynamically set the Femtocell Cell Range Expansion(CRE) offset value in real time, The scheme is used to relieve the high hot spot load pressure of the macro base station and incr-ease the network capacity, so that the user can reasonably choose to access different base stations, and the power resources can be reasonably used to achieve load balancing. The simulation results show that compared with the existing schemes, the proposed scheme improves the cell edge data rate and the energy efficiency, and achieves a better load sharing effect under the condition of Macrocell communication performance.
引文
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[18]王鸿,宋仁旺,李丽君.Macro/Femtocell异构网络基于能效的资源分配[J].计算机应用研究,2018,35(11).
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[2] Ntt D.Evaluation scenarios and assumptions for intra-eNB CoMP[C]//3GPP Tsg Ran Wg1 Meeting,Valencia,Spain,18-22 January,2010.
[3]许娟雄,刘伊莎,唐伦,等.LTE-Advanced异构网络中负载均衡研究进展及展望[J].电信科学,2014,30(10):116-128.
[4] Naganuma N,Nakazawa S,Suyama S,et al.Adaptive control CRE technique for eICIC in Het-Net[C]//Proceedings of the Eighth International Conference on Ubiquitous and Future Networks,2016:4-6.
[5] Zhang F,Sun S,Chen N,et al.A novel adaptive user association scheme for downlink balance in heterogeneous networks[C]//Proceedings of the International Symposium on Communications and Information Technologies,2016:57-60.
[6] Mikami M,Maiti S,Yoshino H.Cell identification pcing cre based on a hierarchical synchronization signal structure[C]//Proceedings of the IEEE Vehicular Technology Conference,2016:1-5.
[7] Nakazawa S,Naganuma N,Otsuka H.Enhanced adaptive control CRE in heterogeneous networks[C]//Proceedings of the Consumer Communications&Networking Conference,2017:645-646.
[8] Zhang L,Zhao S,Shang P,et al.Distributed adaptive range extension setting for small cells in heterogeneous cellular network[C]//Proceedings of the IEEE Vehicular Technology Conference,2017:1-7.
[9]汪朝晖.基于Q学习的Macro-Pico异构网络干扰协调算法研究[D].哈尔滨:哈尔滨工业大学,2015.
[10] Cakir M,Kalaycioglu A.Power adjustment based interference management in dense heterogeneous femtocell networks[C]//Proceedings of the International Conference on Computer and Communication Systems,2017:133-137.
[11]李毅潇.Femtocell中混合接入性能分析及接纳控制机制研究[D].重庆:重庆邮电大学,2013.
[12] Wang Z,Xu X,Zhang R.Optimal macrocell partitioning for redistributed fractional frequency reuse in heterogeneous networks[C]//Proceedings of the IEEE International Symposium on Personal,Indoor,and Mobile Radio Communications,2015:2374-2378.
[13]周杰.异构蜂窝网部署策略和节能机制研究[D].北京:北京邮电大学,2017.
[14] Kamal A,Mathai V.A novel cell selection method for LTE HetNet[C]//Proceedings of the International Conference on Communications and Signal Processing,2014:738-742.
[15] López-Pérez D,Chu X.Inter-cell interference coordination for expanded region picocells in heterogeneous networks[C]//Proceedings of the 20th International Conference on Computer Communication and Networks,2011:1-6.
[16] Yang X S.A new metaheuristic bat-inspired algorithm[C]//Proceedings of IV International Workshop on Nature Inspired Cooperative Strategies for Optimization(NICSO2010),2010:65-74
[17]李先达.基于业务分布的高能效异构网络基站部署研究[D].北京:北京邮电大学,2015.
[18]王鸿,宋仁旺,李丽君.Macro/Femtocell异构网络基于能效的资源分配[J].计算机应用研究,2018,35(11).
[19]毛亭力.无线异构网络中能效优先的功率分配和用户接入研究[D].成都:电子科技大学,2014.