As I read that without USIM card an emergency call can be done. Now question, How MME make sure that UE is genuine ? Is there any change on NAS level messaging from the normal attach procedure ?
For full details please refer the below link http://tech.queryhome.com/42881/explained-emergency-calls-in-lte-network
Does there any difference of handing Attach Request for these two scenarios ?
Could you please send any one call flow/concept of eDRX and power saving mode from mme /epc perspective?
