3G to LTE Handover - how does eNodeB selects the desired MME?

Mobility
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1

Hi,
In case of a HO from 3G to LTE, how does the eNodeB selects the desired MME? Is there a way to select the MME node? For example can the eNodeB trigger a DNS query? If so in what format?

2

Not have handover from 3G to 4G. If have, msc/sgsn will interact with MME then MME select enb, not enb select MME.

3

hi … i dont think so. Consider a UE moving from 3G to 4G, during the process the UE will send a tracking area update to eNnode, which in turn will send it to the MME … my question is how does the eNodeB selects an MME ?

4

This is reselection from 3G to 4G, not handover.
In TAU, UE not have last visited MME, enb randomly select any MME in the pool.

5

understood and thanks for your reply.
i had the impression that there is a way to extract details from tmsi/guti to forward ue to the preferred enodeb using nri/mmec etc.

also is there a better way to make a handover rather than a reselection?

6

Hi Team
Need support for below case: need to enable 3G to 4G dedicated voice handover Nokia

Activity already done:

  1. Enabled WCEL parameter LTE HO enabled
  2. created ADJE Neighbors.
  3. checked HOPL, FMCL PM

But still 3G to 4G HO is not successful.

Any suggestions ( or any PM to be implemented at Core end)?

7

You can check Cell priority and inter RAT HO parameters.

Also one PSHO from WCDMA to be enabled, I think in eNB.