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I applied via Referral and was interviewed before Nov 2022. There were 4 interview rounds.
NAS security mode is used for authentication and encryption in LTE networks, while AS security mode is used for authentication and key agreement in 5G networks.
NAS security mode is used in LTE networks for authentication and encryption of user data.
AS security mode is used in 5G networks for authentication and key agreement between the UE and the network.
Attach procedure involves the UE connecting to the network and es...
S1 and X2 Handover procedure involves transferring control of a mobile device from one base station to another.
Handover is necessary when a mobile device moves out of the coverage area of one base station and into the coverage area of another.
S1 handover is intra-frequency handover, where the mobile device stays on the same frequency but changes the serving cell.
X2 handover is inter-frequency handover, where the mobile...
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