| So far,with the development of mobile communications,WCDMA system has been completed.Call admission control algorithm is an important aspect of Radio Resource Management.With the evolution of WCDMA version,call admission control algorithms are changing.Proper call admission control algorithms can make efficient use of system resource and keep the largest system capacity,while ensuring the stability of system.In this paper,we put forward a call admission control algorithm of HSPA+based on HSDPA technology.Through the simulation results,we make a detailed analysis of this algorithm.At first,we make a brief introduction of WCDMA and raise a Call admission control algorithm.Then describe the evolution of WCDMA and analysis the key technology of WCDMA,HSDPA,HSUPA and HSPA+.That illustrated the Access control algorithm need to update constantly and Advance with the times.after that we study two basic call admission control algorithm of WCDMA system,these algorithms are based on power and throughput.On this basis,we analyze a Dual-Threshold call admission control algorithm of HSDPA.Finally,this paper raise a call access control algorithm based on HSPA+.This algorithm consider the impact of E-FACH and the Situation that E-FACH map on HS-DSCH to carry some low-rate business,and this Make up the deficiency of call admission control when we enter the R7 period.Then compare the ordinary urban with density urban and the business in low peak period with the business in high peak period,that Proved algorithm is feasible. |
