When several transmitters provide coverage to a geographic location it is necessary to determine which of them will establish communication with a receiver located at that site, in other words, which of them will be the desired transmitter or 'best server'.
There are different criteria for determining the desired transmitter at each location. A transmitter must exceed the value of receiving threshold of the associated receiver for being considered as best server.
The methodologies the user can select to determine the desired transmitter are:
•Better signal. The transmitter that provides the best signal level at the receiving location is considered as best server.
•Distance. The transmitter that provides the best signal level at the receiving location is considered as best server.
•Delay. The transmitter whose signal arrives first to the receiving location, among those that exceed the receiving threshold is considered as desired transmitter. In the case of an SFN network this option will provide a different result since it will take into account the transmitters static delay.
•Better difference to threshold. The transmitter that provides the greatest difference respect to the receiver's reception threshold associated with its coverage. In the case that all receivers have the same receiving threshold (typical case), this choice is exactly the same as "Bigger Signal".