Resource reservation in call admission control schemes for CDMA systems with non-uniform traffic distribution among cells

In this paper, we propose the reservation type call admission control (CAC) scheme for CDMA systems with non-uniform traffic distribution among cells to resolve the intercell unbalanced traffic problem. Differently from a conventional CAC scheme where the system resource is fully allocated to the local users in home cell, the proposed CAC scheme reserves small portion of the system resource for new calls occurring in the neighboring cells instead of fully allowing the local users in home cell to occupy the system resource. As a result, the proposed CAC scheme improves the overall call blocking probability when traffics are non-uniformly distributed among cells. More specifically, the proposed CAC scheme improves the overall call blocking probability by 15% when one cell has 67% more traffic than its surrounding cells.