Dynamic Group PCI Assignment Scheme
The Physical Cell Identity (PCI) is used to identify femtocell in LTE femtocell as the physical layer identity. Due to the fact that the PCIs are normally allocated without planning; and the limitation of the number of PCI, the cross-tier PCI confusion problem has arisen. The current solution in 3GPP Release 9 is to use Cell Global Identity (CGI) associated with PCI to solve this problem of confusion. However, using CGI has many serious drawbacks. Especially CGI might cause the inbound-handover is failure. In order to mitigate the CGI problem, this paper proposes a dynamic PCI assignment scheme of DGPCI in the macrocell and femtocell environment. The proposed scheme is tested by using system-level simulation.