Cell phones are full duplex, so they don't have the issues of determining where a data packet starts and ends. DCS is a single channel that can only handle traffic in one direction at a time, so there has to be a traffic cop to determine when it's OK to talk. As Adrain! says, the other major issue is a single DCS channel only services at most a couple hundred feet of track, so any logic has to be duplicated over and over. Finally, the engine return traffic being amplified is very costly.
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