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TAU procedure within S1 Based Handover

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During s1 based HO(normal) without SGW change, Target MME sends Modify Bearer Request to Serving GW. At the same time TAU procedure is triggered without SGW change, again Target MME sends Modify Bearer Request to Serving GW. Is it mandatory to send Modify Bearer Request two times. If yes, what's the difference between the two messages. please provide me reference...

posted Jun 22, 2016 by Mohanraj R

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