Abstract
The introduction of 3G technology brings a range of previously unavailable multimedia services to the mobile user. However, it also presents operators and equipment designers with a number of fresh challenges. One of these challenges is that, until complete 3G coverage is achieved, if it ever occurs, users will depend on the existing 2G/2.5G networks to ensure complete coverage. To achieve this, they will need to roam ubiquitously and seamlessly between the two different radio access technologies (RAT). Inter-RAT (or intersystem) handover is the process of maintaining a phone connection while moving from one cell to another of different RAT. A number of solutions have been developed to overcome the problems specifically associated with inter-RAT handover between UMTS and GSM/GPRS. The article discusses some of them.
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