LTE : Is it possible target eNodeB send the uplink grant in advance to UE within the handover command message ?

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I was thinking, Is it possible UE sends RRC connection reconfiguration complete message to target eNodeB without doing the RACH ? I meant to say, resource reserved by target eNodeB and send to UE within the handover command message ?

posted Mar 21, 2016 by Harshita

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1 Answer

Hi,
If RRCConnectionReconfiguration Carries MobilityControlInfo then UE has to do contention free rach to the specified target ENB,and its not possible in a handover that RRCConnectionReconfiguration go without MobilityControlInfo.
To get the Uplink Sync with the target ENB,UE has to do rach to the specified target Cell even if RRCConnectionReconfiguration carries SR configuration .
Maximum ENB can send SR configuration as part of the phy-configuration but still UE will have to get in a sync with the target for which UE has to do rach as per the rach and prach configuration present in the mobilityControlInfo.
Correct me if I am wrong.

answer Mar 21, 2016 by Ashish Barapatre

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