he cell. A new request is only granted if it is estimated that QoS for the new bearer can be fulfilled, while still being able to provide acceptable service to the existing progress sessions in the cell having the same or higher priority. APN identifies an IP packet data network (PDN) that a mobile data user wants to communicate with. 3GPP Evolved Packet System (EPS) Table 3.9 Standardized QCI characteristics Packet Delay Budget Packet Error Loss Resource Type Priority (Note 1) Rate (Note 2) Example Services 100 ms Conversational Voice (Note 3) 150 ms Conversational Video (Live (Note 3) Streaming) 50 ms Real Time Gaming (Note 3) 300 ms Non-Conversational Video (Note 3) (Buffered Streaming) Non-GBR 100 ms IMS Signaling (Note 3) 300 ms Video (Buffered Streaming) (Note 4) TCP-based (e.g., www, e-mail, chat, ftp, p2p file sharing, progressive video, etc.) 100 ms Voice, Video (Live Streaming) (Note 3) Interactive Gaming 300 ms Video (Buffered Streaming) (Note 5) TCP-based (e.g., www, e-mail, chat, ftp, p2p file sharing, progressive video, etc.) (Note 6) Note 1: A delay of 20 ms for the delay between a PCEF (Policy and Charging Enforcement Function) and a radio base station should be subtracted from a given PDB (packet delay budget) to derive the packet delay budget that applies to the radio interface. This delay is the average between the case where the PCEF is located "close" to the radio base station (roughly 10 ms) and the case where the PCEF is located "far" from the radio base station, for example, in case of roaming with home routed traffic (the one-way packet delay between Europe and the US west coast is roughly 50 ms). The average takes into account that roaming is a less typical scenario. It is expected that subtracting this average delay of 20 ms from a given PDB will lead to desired end-to-end performance in most typical cases. Also, note that the PDB defines an upper bound. Actual packet delays - in particular for GBR traffic should typically be lower than the PDB specified for a QCI as long as the UE has 