zation certificates reside outside the network. Still there are a lot of measures that can be taken inside the networks. See Chapter 6. 5.10 FUTURE SERVICE DEVELOPMENT Initially it should be pointed out that WLAN systems can already cope with broader bands than 3G, as indicated in Figure 3.45. The evolution of application areas in mobile systems after 3G can be described as three main streams. See also Figure 5.16. 1. More of the same - This evolution stream contains mobile applications in 3G that benefit primarily from higher bit rates in 4G. Quality improvements relative to 3G are a main benefit together with new applications demanding very high transmission bandwidth. We can expect these benefits in optional combinations: - Very low, almost no response times. - Improved picture quality (very high resolution, 3D photos with no movements delay at zooming and turns). - Virtual and augmented reality. One usage example is new generations of mobile e-commerce where the user inspects an item before making a purchasing decision. Another example is new generations of mobile group communication for collaborative working, video conferencing and interactive games, all these with virtually unlimited number of attendees. Group communications used for dispersed work groups or game groups with anywhere participants can get much better resolution pictures, faster response times and improved 3D virtual reality capabilities. Services Network 3G applications 'more of the same" Mobile 4G and on Fixed network broadband applications go wireless/mobile Fixed Broadband NB WB (extreme bit rates) 0.384 Bandwidth (Mbps) Figure 5.16 New possibilities will be offered by '4G' wireless systems 2. 'Wired network broadband applications go wireless' - Here high ('extreme') bit rate applications that exist in the wired systems can become mobile. For example, distributed communities/workgroups, video conferencing and digital TV for mobile devices with large screens. Seamless mobility between wireless and wired networks becomes possible for these 