top button
Flag Notify
    Connect to us
      Facebook Login
      Site Registration Why to Join

Facebook Login
Site Registration

LTE: What MME does in case of overloaded situation ?

+1 vote
114 views

I want to know what are all actions taken by MME towards core network nodes when it gets overloaded ?

posted Apr 28, 2014 by Vimal Kumar Mishra

Share this question
Facebook Share Button Twitter Share Button Google+ Share Button LinkedIn Share Button Multiple Social Share Button

1 Answer

0 votes

As per my knowledge, eNodeB performs load balancing between the MMEs connected to the eNodeB.
In S1 SETUP RESPONSE message, each MME reponds with its "Relative MME capacity" to the eNodeB.

If MME still gets overloaded, it sends OVERLOAD START message with the action need to be taken at eNodeB for the further incoming signalling (RRC Connection Request) from the UEs.

With respect to your question, MME can initiate "UE Context Release procedure " for some of the selected UEs to move them to another MME. To achieve this, MME sends "UE CONTEXT RELEASE COMMAND" message to enodeB with the cause "Load balancingTAU" required.

Once the MME receives this UE Context Release Command message from the MME, it initiates RRC Connection Release procedure for that UE by sending RRC Connection Release message to UE with the cause "LoadbalacningTAU".

answer Apr 30, 2014 by Harshita
Similar Questions
0 votes

When target eNodeB is not able to allocate resource for all the bearers which comes as part of Handover Request message, it sends handover request ack with partial success since "E-RABs Failed to Setup List" is present in HOReqAck message.
What MME or source eNodeB does in that case ? Does any action taken by MME for the E-RABs which failed to setup at target eNodeB or some other actions taken ?

+1 vote

As one failure message is defined in specification for the path switch procedure then what would be the behavior of target eNodeB after getting failure response from the MME ? Action would be vendor specific or standard action has been defined for this scenario ?

+4 votes

This is the format, I know PLMN is encoded.

enter image description here

Is there any change in the above format for three digits MNC ?

+5 votes

As part of S1-AP procedure with MME relocation, Handover Required message sent to source MME. Target eNodeBId is present within the handover required. How source MME figure out target cell is being served by XYZ MME and sends "Forward relocation Request" message to XYZ MME.

Please provide reference also if it is there ?

Contact Us
+91 9880187415
sales@queryhome.net
support@queryhome.net
#280, 3rd floor, 5th Main
6th Sector, HSR Layout
Bangalore-560102
Karnataka INDIA.
QUERY HOME
...