rmwambu
2012-07-11, 03:49 PM
The services to be offered by 3G Networks were listed by the ITU-T in their IMT-2000 Concept: Based on high-quality, anytime anywhere communication, support would be offered for data transport, Internet and Intranet access and, in particular, multimedia services. The first thing to observe is that “anytime anywhere communication” has not quite become reality. While a mobile network is available almost anywhere—UMTS, cdma2000, WLAN hotspots, WiMAX, etc.—the user is not necessarily able to access it: technologies are heterogeneous and incompatible, inter-technology roaming is not fully possible as yet.
On the other hand, devices are increasingly multi-homed: they support several radio interfaces, e.g. HSPA,WLANand Bluetooth, in order to always be able to connect. It is noteworthy however, that these radio interfaces are operated independently. The user has to actively select which interface shall be used and it is not possible to handover a session for most them. READ FURTHER AT: http://trends-in-telecoms.blogspot.com/2012/03/coverage-prediction-for-heterogeneous.html
On the other hand, devices are increasingly multi-homed: they support several radio interfaces, e.g. HSPA,WLANand Bluetooth, in order to always be able to connect. It is noteworthy however, that these radio interfaces are operated independently. The user has to actively select which interface shall be used and it is not possible to handover a session for most them. READ FURTHER AT: http://trends-in-telecoms.blogspot.com/2012/03/coverage-prediction-for-heterogeneous.html