Can MME send paging message without TMSI ID?
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MME can initiate paging procedure either with S-TMSI or IMSI. As per descriptions present in specifications, MME sends paging with IMSI in abnormal cases. Network failure is one of the examples of abnormal case. After recovery from the network failure, MME might have lost UE tracking area list and other information. In this case, MME initiates paging with IMSI value towards all the eNodeB comes under the tracking area being served by this MME.
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