Computer Science ›› 2016, Vol. 43 ›› Issue (11): 88-93.doi: 10.11896/j.issn.1002-137X.2016.11.016

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Cell Selection GSPN Model Constrained by Call Admission in Macro-Femto Networks

WANG Kai, CHEN Xin and XIANG Xu-dong   

  • Online:2018-12-01 Published:2018-12-01

Abstract: Alone with the increase of data service,it can not meet the traffic demand only by using macrocell deployment.As an efficient means to offload macrocell traffic,femtocell networks are introduced and formed the Macro-Femto architecture.Cell selection will be an open challenge when Macro-Femto network is deployed.As for channel resource scarcity in femto-base station,putting call admission on femtocell network may also be of great concern.Graphi-cal generalized stochastic Petri net(GSPN) characters parallelism,uncertainty and asynchrony,and is suitable to analyze complicated system.For call admission constrains in Macro-Femto networks,the occupancy of calls to channels was first studied and GSPN model was built on call admission by advancing call retrials.Based on GSPN approach,the modified part-retrial-based call admission control strategy was introduced after analyzing the influence of call admission control strategy on call blocking rate.Concerning high-speed service characteristic in femtocell and high capability in macrocell,load-based femto-priority(LFP) selection scheme was proposed with adoption of part-retrial call admission control strategy and GSPN.Simulation results show that,compared with femto-priority selection scheme.The proposed LFP scheme can achieve lower new and handover calls blocking probability by 2.7% and 4.6%.

Key words: Macro-femto network,Call admission,Cell selection,GSPN

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