![]() ![]() IRAT GSM to WCDMA HO: IRAT from GSM to WCDMA can be performed even if the radio conditions are good. There are three handover situations described below: 2G to 3G inter-RAT HO, 3G to 2G inter-RAT HO and CN to WLAN HO. Inter-Radio Access Technology Handover performs inter-RAT HO evaluation based on the UE GSM measurement reports. The mobile UE does the measurement of neighbour cells to select the best candidate cell. Handover between different heterogeneous networks is done to retain the service provided to the User Equipment while it moves from coverage zone of one network to another. Keywords 2G, 3G, WLAN, Vertical Handoff, Propagation Model. The proposed model aims towards the convergence of WLAN, 2G and 3G networks. If we see from a users point of view, if these two networks converge it will help to extract the combined benefits of both the systems, hence the need of a seamless and efficient vertical handoff procedure. While Cellular networks like 2G and 3G gives users high mobility but less data rate (2 Mbps), WLANs provide much better data rate (54 Mbps) but less mobility. Performance Optimization of Handover between Heterogeneous NetworksÄepartment of Electronics & Telecommunication, Amity University Noida, Uttar PradeshĪbstract In the near future, WLANs are expected to complement cellular networks.
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