Description:

Abstract: 3GPP has standardized CDMA-based packet-switched air interfaces for downlink and uplink, called High-Speed Downlink Packet Access (HSDPA) and High-Speed Uplink Packet Access (HSUPA) respectively. Significant voice capacity gains are possible by carrying voice (in the form of Voice over IP or Circuit Switched Voice) over HSDPA/HSUPA compared to circuit-switched Dedicated Channels (DCH). The key difference between HSDPA and DCH is that data is transmitted from a single “serving cell” in HSDPA, compared to all cells in the so-called “Active Set” in DCH.