CSFB-Cell Selection Reselection and Handover Between LTE and 3G Network

The evolution of Mobile communication over time have grown from second generation and still growing. Since LTE is a packet based all IP network, which cannot support terrestrial circuit switch call, therefore, Circuit switch fall back is needed to redirect this service to existing UMTS/GSM network. Customers' requirements for radio resources increases with the use of devices and smart phones, however, to satisfy this demand access to packet data services and voice are needed at all time. This work intends to analyze how user/subscriber latched on preferred technology, communicate while mobility takes places without facing drop calls both PS and CS between LTE and 3G network. Network Operators goal is to ensure optimal, seamless coverage for its users while roaming from one cluster/location area to another cluster without distortion. The demand for radio resources increases, hence optimizations (soft or physical adjustment) are carried out at interval to improve network quality and coverage.