A Review of Cellular Networks Technology Channel Handoff TDMA and FDMA using Hybrid Scheme

Sonali Gupta, Sheilly Padda, Umesh Sehgal, Mohali Landran
2017 IJCSN International Journal of Computer Science and Network   unpublished
Cellular communication is a technology which mainly makes the mobile phones to communicate with each other. In Cellular communication the end user that is the mobile phone user doesn't stay at a particular place but moves from one place to another. Handoff is allot as handover. The channel change due to handoff may be through a time slot, codeword or combination of these for TDMA, FDMA and CDMA or a hybrid scheme. For cellular communication systems, mobility and limited radio coverage of a cell
more » ... requires calls to be handed over from one base station system (BSS) to an another BSS.There are occurrences where a handoff is unsucceful.Lots of research was conducted regarding this in the late 80's main reason was found out. Because frequencies cannot be reused in adjacent cells, when a user moves from one cell to another, a new frequency must be allocated for the call. If a user moves into a cell when all available channels are in use, the user's call must be terminated. In this paper the inter technology handovers where a calls connection is transferred from one access technology to another GSM/UMTS handoff to Wi Fi and Vice versa.