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The paper analyzes the performance of voice services over 3GPP WCDMA Networks for Release 99 and Release 7 deployments. This paper shows, by using simulations, that the system capacity of Release 7 VoIP is significantly higher than the Release 99 circuit-switched voice under similar system conditions and voice quality. These results are obtained under the 3GPP simulation assumptions where uplink and downlink constraints for power, code and interference are considered. Both AMR 12.2 and 5.9 as well as different types of mobile receivers (Rake and equalizer, single and dual receive antennas) are considered. The paper also shows that the capacity and performance can be increased significantly further by using uplink interference cancellation at the base station.
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