On-Demanded Multicast Zone Configuration in CDMA Network Systems

Focusing on enriched multimedia broadcast/multicast opportunities of a wireless communication network, we build multicast cell configurations in a CDMA based network. In a CDMA based wireless network, a terminal can get significant signal quality enhancement by the combining of data streams from multiple base stations. To combine the data streams, the base stations have to be operated with a common time schedule. The cells whose base stations are operated as such are called soft-combine cells. A terminal can take advantage of signal quality enhancement, if the terminal is in a soft-combine cell and at least one neighbor cell supports soft-combine. Our problem is to find a limited number of soft-combine cells under the computing burden of the network controller, while the benefit of soft-combine is maximized. We build a combinatorial optimization model and solution methods for the dynamic reconfigurations of soft-combine supporting cells.