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What are the main causes of network access failure in 3G environment and how can it be reduced? thanks
There can be many reasons; in utran side it can be e.g. admission control (too much rf power in cell, etc), Iub bandwidth, etc. to name few. The nack can also come from Core network. I think you should first investigate with protocol analyse from Iu interface, if it’s coming from Core network and after that decide next steps.
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