| 摘要 |
In a method for inter-frequency handover of a mobile station from forward and reverse links with a current base station of a wireless cellular system to new forward and reverse links usually with a new base station utilizing a CDMA modulation type, dropped calls are substantially eliminated by increasing spreading factor during the handover. Thus, a handover command is sent from the current base station to the mobile station which identifies a new operating frequency, a final spreading factor, and a starting spreading factor which is at least double, and preferably at least four times, the final spreading factor. The mobile station switches its operating frequency in accordance with the identified new operating frequency, and establishes new forward and reverse links from the mobile station at the new operating frequency and the identified starting spreading factor with the new base station. The mobile station then signals the new base station that the handover is complete and the frame number of the detected frame. The new base station and the mobile station switch to the final spreading factor a predetermined number of frames after this frame number.
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