- nology) sets the limit to. Thus, services will pop up, some 4.2.1.2 Services will become popular for a while and then just fade away, whereas some others will never become a hit. Some Delivering services to the end users is the fundamental services will become classics that will live and be used for goal of any mobile-communication system. Knowing a very long time. them, understanding them, managing them, and charging them properly is the key for success. It is also the most 4.2.1.2.2 Traditional telephony services difficult task being faced by the engineers developing the Going toward IP-based services obviously does not mobile-communication system of the future. It is very mean that traditional services that have been provided The common denominator between mobile Internet services and Internet services is the IP addressing technology with the IPv4 and IPv6 addresses identifying the end receiver. However, there is a need to handle the mobility provided by the cellular systems. Mobile IP is one possibility, but most of the cellular systems (if not all) have their own more efficient mobility mechanism. The motives behind the 3G evolution CHAPTER 4.2 over the circuit-switched domain, in successful mobile- adaptive to the changing service environment. Luckily, communication systems like GSM, will disappear. there are a few known key services that span the tech- Rather, it means that the traditional circuit-switched nology space. Those are: services will be ported over the IP networks. One Real-time-gaming applications: These have the char- particular service is the circuit-switched telephony acteristic to require small amount of data (game service that will be provided as VoIP service instead. update information) relatively frequent with low Thus, both the new advanced services that are enabled delay requirement. Only a limited delay jitter is by the technology advancement of the devices and the tolerable. A first person shooter game like Counter traditional circuit-switched services will use IP as the Strike is 