A study on soft handoff in IP-Based CDMA system

In IP-based CDMA systems, the two key problems need to be solved for soft handoff are data distribution and data content merging. A new scheme is introduced here, using a soft handoff distribute table maintained by the access router. This makes it possible to distribute data accurately, retain multiple base stations (BSs) within an IP subnet, and let mobile station (MS) moves into one subnet without changing its IP address. Strict synchronization could be avoided by using different description of data and setting soft handoff mode bits. Therefore the MS receives the data accurately, and system capacity can be improved.