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``` TS36.413 8.7.3 S1 Setup 8.7.3.4 Abnormal Conditions If the eNB initiates the procedure by sending a S1 SETUP REQUEST message including the PLMN Identity IEs and none of the PLMNs provided by the eNB is identified by the MME, then the MME shall reject the eNB S1 Setup Request procedure with the appropriate cause value, e.g., “Unknown PLMN” ``` Modified code to address abnormal conditions where the eNB initiates the S1 Setup Request with a PLMN Identity IE that is unrecognized by the MME. In this case, the MME now properly rejects the S1 Setup Request with the cause value "Unknown PLMN" in compliance with the 3GPP specification (8.7.3.4).
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