Inter-RAT Cell Reselection from GSM to UMTS
When MS in a GSM cell obtain the list of neighboring UMTS cells and cell reselection parameters through System Information 2ter and System Information 2Quater. Based on the list and parameters, the MS measures the neighboring UMTS cells. When the MS is in idle mode or packet transfer mode, the method for cell reselection from a GSM cell to the UMTS cell is the same as that between GSM cells. The GSM network controls the cell reselection from the GSM cell to a UMTS cell through TDD Cell Reselect Diversity . TDD Cell Reselect Diversity indicates the signal strength difference between candidate UMTS cells and the serving GSM cell. This parameter is a key factor for controlling the cell reselection from the GSM cell to the UMTS cell. CPICH RSCP > RLA_C + TDD Cell Reselect Diversity When TDD Cell Reselect Diversity is set to a small value, the cell reselection condition is easy to meet. In this case, the number of MSs that camp on the GSM cell reduces. When TDD Cell Res...