The challenge for 3G cellular is not only to support varied services at speeds to 2 Mbps, but to support these services efficiently and with good quality. A method to optimize the capacity available to high-speed data is to consider placing dual mode circuit-switched calls on an alternate cellular network (i.e. 2G or 3G). For a mature UMTS network with high data demand, more capacity becomes available for 3G packet (and high-rate circuit) data, if dual mode 3G speech is preferably placed on the GSM network. Our integrated network solution shows that 2G phones may be serviced fairly, by overflowing calls between the 2G and 3G networks, if the 2G network is at capacity.
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