UE: NAS and PDCP UE fixes for Com4Innov tests
Several issues blocking Attach procedure and data transfer were found in NAS UE part during tests with Com4Innov:
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eNB requested IMEISV, but UE do not answer it
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ksi computation was wrong if ksi is different from 0
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emergency NAS was not supported
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S1: PDCP not receiving/transmitting data to network interface
Investigation by Eurecom and TCL