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Handover - HANDOHandover is a process where a mobile communication device that is operating on a particular frequency and time slot or code is reassigned to a radio frequency and/or time slot or code.
Handover Operation
This figure shows the basic call handover process. In this diagram, a mobile telephone is communicating with base station #1. Base station #1 provides the mobile telephone with a list of radio carrier channels to measure nearby base stations (step 1). After the mobile telephone measures the quality of the radio carrier channels, it returns this information to the serving base station (step 2). Using this information and information from neighboring base stations, the serving base station sends a handover message (step 3) which instructs the mobile telephone to tune to a new radio carrier channel of the adjacent base station #2. The mobile telephone begins transmission on the new channel by sending a short burst (step 4). The new base station uses this information to send a command to adjust the relative timing of the mobile telephone (step 5). After the mobile telephone has adjusted, the voice channel from the MSC is switched from base station #1 to base station #2 and voice conversation can continue (step 6).
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