摘要
结合信道借用和流量转移技术提出了一种混合动态流量均衡算法。使用该算法热点小区可以向紧凑模式中的同类型轻负载小区借用信道,同时还可以按一定条件将呼叫转移到与热点小区重叠覆盖的异构轻负载小区中,每个流量周期借用的信道数和转移的呼叫数将根据热点小区的剩余可用信道数和新呼叫到达率来计算。仿真结果表明,该流量均衡算法能够显著降低热点小区系统和整个异构系统的新呼叫阻塞概率、切换呼叫掉线率,而且整个异构系统的利用率也得到了相应提高。
A hybrid dynamic load balancing algorithm based on the combination of channel borrowing scheme and load transfer scheme was proposed. The hotspot cells can borrow channels from homogeneous ceils with light workload in the compact pattern. At the same time, some ongoing calls can be transferred from hotspot ceils into the overlapping heterogeneous cells with light workload according to certain conditions. The number of borrowed channels and transferred ongoing calls per load balancing period was computed by the remainder available channels and new calls arrival rates in the hotspot ceil. Simulation results show that the proposed hybrid dynamic load balancing algorithm can decrease the blocking probabilities, dropping probabilities of hotspot cell system and overall heterogeneous system, the channel utilization of overall heterogeneous system is increased accordingly.
出处
《通信学报》
EI
CSCD
北大核心
2007年第1期75-81,86,共8页
Journal on Communications
基金
国家自然科学基金资助项目(603905405)~~
关键词
异构分层无线网络
流量均衡
信道借用
流量转移
heterogeneous hierarchical wireless networks
load balancing
channel borrowing
load transfer
