A recent report by HeavyReading concluded that "RAN Congestion is Getting Worse" (here) and that "A majority of operators want real-time or near-real-time information on congestion when applying controls".
A number of vendors, usually based on partnerships between networking devices and policy control offer solutions to the problem (see Vasona, RADCOM/HP, RADCOM/Amdocs, Movik, Sandvine, Broadband Systems).
Allot Communications and Amdocs published a presentation explaining their joint solution for policy-based cell congestion (note that the subscriber location is noted only when the session starts).
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Above solution as assumption that users are getting exact same bandwidth that is given by amdocs; but in reality that is not the case.
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