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While reestablishment How AS security will be re activated?

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How UE receives Kenb while re establishing the connection ?

posted Jan 11 by Karan Patel

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1 Answer

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The new security keys are generated as part of rrc re-establishment procedure at the eNodeB. There is a field "nextHopChainingCount" in the rrc re-establishment message sent to UE. UE re-generates security keys based on this parameter.
Please refer the LTE security spec (33.401) to get more details on key generations.

answer Jan 11 by Harshita
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Upon detecting Radio Link Failure UE will do RRC Connection re-establishment but to do RRC Connection re-establishment security should be activated in UE, otherwise UE will go Idle mode.So here(After detecting RLF) we are resetting all PHY,MAC,RLC,PDCP Configurations but why we are making security should be there to do RRC Connection re-establishment.

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