Hi everyone, I have some specific question about radio resource allocation in 3G data network. In the UMTS 3G data network, the smartphone has to acquire radio resource from RNC before it can talk to any server on the Internet. Allocating radio resource usually takes a few seconds (2+ seconds) to complete and thus causes delays to the smartphone applications. This process will involve RRC connection setup and radio bearer reconfiguration. From my observation, the delay caused by the radio resource allocation varies a lot over time and seems it is not only caused by the radio access network. So I was wondering what network devices are involved in the radio resource allocation besides the phone, base-station and RNC? And what are the factors that can potentially affect the observed delay? Thanks a lot! -Gary