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

529 views

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

Share this question

Facebook Share Button

Twitter Share Button

LinkedIn Share Button

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

Similar Questions

+2 votes

LTE handover: Why does "TAC" required as part of "Target Id" IE within the forward relocation request message ?

In case of S1-handover with the MME relocation, source MME sends an information "Target Identification" to target MME.
What the target MME does by receiving TAC, when an enodeb can be identified uniquely by using combination of (PLMN + Macro/Home ENodeB) ?

Can someone tell me what the purpose behind to send TAC as part of Target Id IE ?

+2 votes

LTE HO: Is it possible after successful resource allocation at target eNodeB, source eNodeB sends HO Cancel ?

Is it possible, source eNodeB has received "handover command" message from MME and now it want to cancel handover procedure ?
What could be the possible reasons when source eNodeB want to cancel ongoing handover procedure ?

+2 votes

LTE: How source eNodeB get to know when it has to trigger handover required message towards MME ?

I have basic handover related query. How source eNodeB get to know when it has to trigger handover required message ? I mean to ask, how a source eNodeB come to know the threshold values of RSRP or RSRQ or both (related to target eNodeB) , required to do a successful handover towards eNodeB ? Is it due to network planning ?

+2 votes

LTE: How an eNodeB come to know about CDMA2000 Sector ID while building the "UPLINK S1 CDMA2000 TUNNELING" message ?

Does UE inform to eNodeB in any RRC message ? Or eNodeB itself has static configuration ?

+2 votes

LTE: How does a target enodeB get to know which of the cell need to prepare for a received handover request ?

When source enodeB triggers Handover Required message to MME. It just has Target ID ( which just tells about the target eNodeB Id ) not at the cell level granularity . My concern is how target eNodeB figure out which of the cell out of 256 cells, need to be prepared for the received handover request message. Is there any IE carry such information within Handover Required or handover request message ?

...