3G system development is not satisfactory. Systems before HSPA did not show obvious advantages over 2G. Due to technical maturity, IPR and other issues, network deployment was slow. New technologies, such as OFDM used in mobile communication systems, gradually matured. Other mobile/quasi-mobile communication systems, especially mobile WiMAX (IEEE802.16e) challenged. WiMAX claims a maximum downlink rate of 75Mbps, which is far higher than HSDPA.
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