| 摘要 |
A method for soft handover in a cellular mobile radio network comprises the steps of determining Signal-to Interference-Ratio (SIR) targets for a mobile and sending the SIR targets to base stations (A, B). In the method the CPICH power from the base stations (A, B) is measured when the mobile terminal is entering the soft handover region between the starting cell (A) and a neighbouring new cell ( B), and a link is added to the mobile, when the CPICH power is within a preset range, providing connection in uplink and downlink directions between the mobile terminal and the base stations A and B, respectively. In the method the base station (A) is commanded to increase the SIR target for the uplink connection of the mobile terminal for forcing the mobile terminal to increase the transmission power until the determined SIR target in the cell (B) has been reached, and when it is confirmed that both uplink and downlink connections are available through cell B, the soft handover is completed by commanding the cell (A) to delete the connection to the mobile terminal. The RNC is configured to control the soft handover for a mobile terminal and comprises means for performing the soft handover. |
