dns - LTE: how eNodeB selects a MME (FIRST attach)?

Question

I'm trying to figure out how eNodeB can select the MME, as far as I know, I think eNodeB query to a DNS (iDNS?) with the TAI FQDN, is made up with TAC low bit, TAC high bit, MCC and MNC I mean something like

tac-lb.tac-hb.tac.epc.mnc.mcc.3gppnetwork.org

but where eNodeB send that TAI FQDN?? Is there a list into eNodeB with the MMEI?

Where is the DNS? How eNodeB query it?

In case of eNodeB already has a MMEI list into it.... Any example? Any eNodeB config file? Something that can help me to reach out to understand?

Regards

Answer 1

该概念基于3GPP 规范MME selection function的部分4.3.8.3。23.401'MME选择功能选择一个可用的MME来服务UE。该选择基于网络拓扑，即所选MME服务于UE的位置，并且对于重叠的MME服务区域，该选择可能优选具有降低改变MME概率的服务区域的MME。当 MME/SGSN 选择目标 MME 时，选择功能在可能的目标 MME 之间执行简单的负载平衡。