Virtual Labs

Demonstrate Connection Management Procedures

In 5G CM, which layer primarily governs CM-IDLE and CM-CONNECTED states?

a: Radio Resource Control (RRC) Explanation

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b: NAS (Non-Access Stratum) Explanation

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c: SCTP Layer Explanation

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d: PHY Layer Explanation

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What is the primary purpose of the CM-IDLE state?

a: UE maintains an RRC connection but no NAS connection Explanation

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b: UE has no MM or SM context Explanation

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c: UE is reachable and has an active NAS connection but without an RRC connection Explanation

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d: UE is fully detached from the network Explanation

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Which of the following triggers a UE to move from CM-IDLE to CM-CONNECTED?

a: A periodic registration update Explanation

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b: Service Request procedure Explanation

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c: UE SIM refresh Explanation

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d: UE entering airplane mode Explanation

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Which message does the UE send to initiate the Service Request procedure?

a: RRC Setup Complete Explanation

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b: Registration Request Explanation

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c: InitialUEMessage with NAS Service Request Explanation

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d: Path Switch Request Explanation

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Which network function restores user context after receiving the Service Request?

a: UPF Explanation

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b: SMF Explanation

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c: AMF Explanation

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d: PCF Explanation

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After a successful Service Request, which state does the UE enter?

a: Deregistered Explanation

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b: CM-IDLE Explanation

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c: CM-CONNECTED Explanation

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d: SM-INACTIVE Explanation

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What is the main objective of the UE Context Release procedure?

a: To deregister the UE permanently Explanation

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b: To remove the UE’s subscription profile Explanation

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c: To release RRC and NGAP resources while preserving UE NAS context Explanation

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d: To shut down the UE’s radio interface Explanation

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Who typically initiates the UE Context Release Command?

a: UE Explanation

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b: AMF Explanation

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c: SMF Explanation

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d: gNB AMF interface Explanation

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Which message does the gNB send back after receiving UE Context Release Command?

a: Initial Context Setup Response Explanation

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b: UEContextReleaseComplete Explanation

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c: Service Request Complete Explanation

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d: ResourceStatusResponse Explanation

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What happens to user-plane tunnels when UE Context Release occurs?

a: They are permanently removed Explanation

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b: They remain active but suspended Explanation

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c: They are unaffected Explanation

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d: Only SMF-user tunnels are kept Explanation

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Which condition typically leads to network-initiated UE Context Release?

a: UE sends periodic Tracking Area Update Explanation

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b: Inactivity timer expiry in gNB Explanation

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c: UE switches from NR to LTE Explanation

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d: UPF modifies PDR rules Explanation

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During CM-IDLE, the UE remains reachable for paging through which mechanism?

a: NGAP Control Signalling Explanation

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b: SDAP QoS Flow Explanation

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c: AMF Registration Area and Paging procedure Explanation

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d: SCTP retransmission Explanation

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Which entity triggers paging when downlink data arrives for an IDLE UE?

a: UPF Explanation

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b: gNB Explanation

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c: SMF Explanation

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d: AUSF Explanation

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When the UE receives paging and needs to send a NAS Service Request, which RRC state must it establish?

a: RRC-INACTIVE Explanation

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b: RRC-SUSPENDED Explanation

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c: RRC-CONNECTED Explanation

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d: RRC-NULL Explanation

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Which statement best describes the CM-IDLE to CM-CONNECTED transition?

a: It requires complete deregistration of the UE Explanation

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b: It is triggered only by the network Explanation

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c: It involves re-establishing RRC connection and restoring UE context Explanation

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d: It deletes all user plane sessions Explanation

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