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As a 5G mobile network engineer resolve the following issues. | UE Registration Failure with cause ngKSI already in use and high registration reject rate observed in AMF | Check AMF security context management; verify UE security capability handling; examine authentication vector management in AUSF; validate UDM subscription data; restart affected AMF instance if persistent; check for potential replay attacks by analyzing SUCI/SUPI allocation patterns |
As a 5G mobile network engineer resolve the following issues. | Periodic Registration Update timeout occurring for multiple subscribers in specific tracking area with RRC connection drops immediately following NAS Registration Accept message | Analyze RRC connection statistics for affected gNBs; verify N2 interface stability between gNB and AMF; check AMF timer settings for registration update; examine cell RF performance metrics for coverage gaps; verify tracking area configuration in AMF; check gNB CPU and memory utilization during peak registration period... |
As a 5G mobile network engineer resolve the following issues. | Inter-gNB Xn handover failures with NGAP cause Radio Network Layer Failure and high packet loss observed during mobility | Verify Xn interface configuration between source and target gNBs; check bandwidth allocation for Xn signaling; analyze UE measurement reports for target cell RSRP/SINR values; examine load balancing configuration; verify synchronization between gNBs; check handover preparation timer settings; analyze interference patte... |
As a 5G mobile network engineer resolve the following issues. | Tracking Area Update failures with NAS cause 5GMM cause #7 5GS services not allowed affecting specific IMSI ranges | Check subscriber profiles in UDM for affected IMSIs; verify NSSF slice selection configuration; examine AMF service authorization policies; validate UDM subscription data integrity; check HPLMN configuration in AMF; analyze NAS message integrity protection success rate; verify authentication success rate for affected s... |
As a 5G mobile network engineer resolve the following issues. | Service Request failures with high latency observed before rejection with cause UE identity cannot be derived by the network | Examine AMF context management for temporary identities; check 5G-GUTI allocation mechanism; verify UDM provisioning for affected subscribers; analyze TMSI collision probability; check NAS Timer T3519 settings; examine AMF overload conditions; verify proper UE context cleanup during detach procedures |
As a 5G mobile network engineer resolve the following issues. | N2 Handover failures with cause Resource Unavailable predominantly during peak hours impacting VoNR calls | Check target gNB resource allocation policies; verify QoS flow admission control settings; analyze PRB utilization in target cells; examine UE radio capabilities handling; check AMF load balancing configuration; verify NG-RAN resource status in target node; monitor N2 interface congestion metrics; analyze E2E network s... |
As a 5G mobile network engineer resolve the following issues. | Registration Reject with NAS cause PLMN not allowed for roaming subscribers despite valid roaming agreements | Verify PLMN configuration in AMF; check UDM roaming authorization settings; examine security context exchange with home network; validate NSSAI mapping for roaming subscribers; check NRF service discovery for roaming interfaces; verify diameter routing agent configuration; test SEPP security policies; check for HPLMN i... |
As a 5G mobile network engineer resolve the following issues. | PDU Session Establishment failures for data sessions during mobility with SM cause insufficient resources | Check SMF dimensioning and capacity; verify UPF resource allocation; examine PCF policies for affected data flows; analyze NSSAI to S-NSSAI mapping; check QoS profile configurations; monitor UPF CPU and memory utilization; verify PFCP association between SMF and UPF; analyze N4 interface stability during mobility event... |
As a 5G mobile network engineer resolve the following issues. | High RRC reestablishment rate after Xn handover completion with UL synchronization failures | Check timing advance configuration in target cells; verify random access channel dimensioning; examine preamble collision probability; analyze RACH configuration in SIB1; monitor MAC layer performance counters; check beam management during handover; verify UE RF capability handling; analyze uplink power control paramet... |
As a 5G mobile network engineer resolve the following issues. | Intra-AMF handover failures with NG Setup Failed error despite successful initial NG setup between gNB and AMF | Verify AMF SCTP association stability; check NGAP version compatibility; examine NGAP Transport Network Layer error statistics; verify NGAP Overload procedure functioning; check IP route flapping between gNB and AMF; monitor SCTP heartbeat success rate; analyze AMF CPU spikes during handover attempts; check security co... |
As a 5G mobile network engineer resolve the following issues. | UE reported No Network Service after successful registration in areas with good coverage and RSRP values better than -90dBm | Check PDU session state management; verify APN configuration in UDM; examine DNS resolution for data services; analyze DNN configuration in SMF; verify DNAI selection in UPF; check application detection rules; analyze protocol configuration options; verify default QoS rule enforcement; check UE NAS capability handling |
As a 5G mobile network engineer resolve the following issues. | Registration failures with NAS cause Synchronization failure occurring at specific intervals affecting multiple subscribers | Verify AUSF sequence number management; check SQN synchronization mechanism; examine authentication vector generation in UDM; analyze frequency of authentication procedures; check replay protection mechanism; verify security context lifetime settings; examine SUPI to SUCI concealment algorithm; check UDM/ARPF functioni... |
As a 5G mobile network engineer resolve the following issues. | Inter-AMF handover failures during AMF planned switchover with UE Context not found error | Verify N14 interface functionality between AMFs; check UE context transfer procedure; analyze AMF selection function in NRF; examine registration area planning; verify AMF capacity and load information exchange; check AMF identity correlation; analyze timer settings for context preservation; verify 5G-GUTI allocation m... |
As a 5G mobile network engineer resolve the following issues. | PDU Session modification failures during QoS flow addition with SM cause service option temporarily out of order | Check SMF QoS management function; verify PCF policy decision points; examine dynamic PCC rule creation; analyze binding mechanisms between QoS flows and DRBs; verify correct QFI assignment; check RAN notification of QoS flow establishment; verify UPF capability to support additional QoS flows; examine QoS monitoring m... |
As a 5G mobile network engineer resolve the following issues. | Excessive registration area updates from high mobility UEs causing signaling overload in specific AMF region | Optimize tracking area list assignment algorithm; verify mobility pattern analytics integration; examine UE mobility state estimation; check high-speed railway specific configuration; verify AMF group capacity planning; implement paging enhancements for high mobility; analyze TAI list optimization; check mobility patte... |
As a 5G mobile network engineer resolve the following issues. | UE Context release with cause Radio Connection With UE Lost immediately after Xn handover complete message | Check UE measurement configuration for neighbor cells; verify handover trigger thresholds; examine A3 event configuration; analyze target cell RSRP/SINR vs source cell; check timing advance issues after handover; verify beam management during mobility; examine cell power imbalances; check target cell CQI reporting afte... |
As a 5G mobile network engineer resolve the following issues. | Service Request failures with NAS cause MAC failure affecting specific device models after authentication procedure | Verify NAS integrity algorithm compatibility; check security capability handling; examine UE cryptographic capabilities; analyze integrity protection algorithm negotiation; check NAS counter synchronization; verify NAS security context handling; examine MAC failure logs for pattern recognition; check for UE implementat... |
As a 5G mobile network engineer resolve the following issues. | High RRC setup failure rate after paging for mobile terminated services with UEs failing to respond to paging | Verify paging DRX configuration; check paging occasion calculation; examine PCCH resource allocation; analyze UE power saving mode settings; verify extended DRX configuration; check coverage in paging area; examine SIB1 for paging parameters; analyze optimal paging repetition; check UE specific DRX setting in subscript... |
As a 5G mobile network engineer resolve the following issues. | Random Access procedure failures during handover with high preamble retransmission observed in target cells | Check RACH dimensioning in target cell; verify preamble format configuration; examine PRACH configuration index; analyze RACH resource allocation; check contention resolution timer; verify RSRP threshold for power ramping; examine random access response window configuration; analyze beam correspondence during RACH; che... |
As a 5G mobile network engineer resolve the following issues. | VoNR call setup failures with SIP 503 Service Unavailable errors despite successful PDU session establishment | Verify IMS APN configuration; check IMS signaling QoS flow establishment; examine SIP ALG functioning in UPF; analyze IMS registration procedure; verify P-CSCF discovery mechanism; check SDP offer/answer exchange; examine voice media negotiation; verify EVS codec configuration; check IMS bearer dedication; analyze SIP ... |
As a 5G mobile network engineer resolve the following issues. | GUTI reallocation failures with AMF reporting Old GUTI not recognized causing additional authentication procedures | Verify GUTI allocation algorithm in AMF; check temporary identifier management; examine context data storage duration; analyze AMF restart recovery procedures; verify GUTI reallocation frequency; check UE identity request/response procedures; examine NAS signaling connection management; verify AMF context data persiste... |
As a 5G mobile network engineer resolve the following issues. | N2 handover preparation failures with NGAP cause Transport Resource Unavailable during busy hours | Check N2 interface dimensioning; verify SCTP association parameters; examine IP transport network congestion; analyze QoS marking for NGAP signaling; verify bandwidth allocation for N2; check for IP routing instabilities; examine load balancing across AMF instances; verify proper SCTP multihoming configuration; analyze... |
As a 5G mobile network engineer resolve the following issues. | Registration failures with NAS cause Illegal UE for subscribers with valid authentication vectors | Check UDM subscription data integrity; verify SUPI to SUCI conversion; examine authentication procedure completion; analyze security context establishment; verify USIM status; check operator forbidden IMSI lists; examine authentication response verification; verify sequence number validation; analyze XRES to HXRES deri... |
As a 5G mobile network engineer resolve the following issues. | UE capability transfer failures during handover with target gNB reporting incomplete UE radio capability information | Verify UE capability filtering function; check UE capability transfer procedure; examine UE capability ID assignment; analyze RRC UECapabilityEnquiry message; verify capability compression algorithms; check UE capability version handling; examine UE radio capability for paging message inclusion; verify UE capability st... |
As a 5G mobile network engineer resolve the following issues. | PDU session establishment failures with SM cause maximum number of PDU sessions reached despite UE having only 2 active sessions | Verify NSSAI configuration in AMF; check maximum number of PDU sessions per UE in SMF; examine UE usage setting; analyze session management subscription data; verify PDU session status synchronization between UE and network; check SMF selection procedure; examine UE initiated PDU session release procedures; verify prop... |
As a 5G mobile network engineer resolve the following issues. | Session establishment failures after successful registration with SM cause requested service option not subscribed | Check UDM subscription data for DNN authorization; verify allowed NSSAI configuration; examine session management subscription data; analyze SMF selection procedure; verify QoS profile authorization; check default APN/DNN configuration; examine slice specific authentication; verify network slice selection policy implem... |
As a 5G mobile network engineer resolve the following issues. | Excessive Initial Context Setup failures with cause Radio Network Layer Failure during congested periods | Verify gNB admission control thresholds; check RRC connection setup success rate; examine radio resource availability; analyze PRB utilization patterns; verify active users per cell limits; check handover load balancing function; examine NGAP overload control mechanisms; verify SRB/DRB establishment success rates; anal... |
As a 5G mobile network engineer resolve the following issues. | Periodic registration update rejection with NAS cause Implicitly deregistered despite active data session | Check AMF timers for implicit deregistration; verify mobile reachable timer configuration; examine non-3GPP access registration correlation; analyze UE reachability status management; verify paging procedures before implicit deregistration; check AMF overload protection mechanisms; examine UE activity detection; verify... |
As a 5G mobile network engineer resolve the following issues. | RRC reestablishment failures with high latency before rejection for UEs in connected mode mobility | Verify RLF timers configuration; check RRC reestablishment procedure implementation; examine L2 buffer status during mobility; analyze HARQ feedback statistics; verify SRB management during reestablishment; check timing advance handling during mobility; examine synchronization signal block configuration; verify beam ma... |
As a 5G mobile network engineer resolve the following issues. | Registration area update failures for specific TACs with Tracking area not allowed despite correct configuration | Verify TAI list management in AMF; check forbidden tracking area lists; examine TAC configuration in gNBs and AMF; analyze registration area boundary planning; verify AMF service area consistency; check TAI to AMF mapping; examine AMF selection function during TAU; verify proper TAI broadcast in SIB1; analyze registrat... |
As a 5G mobile network engineer resolve the following issues. | UE requested PDU session modification failures with SM cause operation success but no actual QoS change implemented | Verify PCF policy decision implementation; check SMF QoS modification procedure; examine QoS flow modification signaling to gNB; analyze UPF packet marking implementation; verify QFI to DRB mapping updates; check RAN notification of QoS change; examine NG-RAN QoS implementation; verify end-to-end QoS monitoring; analyz... |
As a 5G mobile network engineer resolve the following issues. | High rate of SgNB addition failures for EN-DC capable UEs with failure cause X2AP Transport Resource Unavailable | Check X2 interface dimensioning between eNB and gNB; verify EN-DC admission control settings; examine X2-AP transport layer configuration; analyze bandwidth allocation for X2-C; verify IP routing configuration between eNB and gNB; check X2 SCTP association parameters; examine load conditions on both eNB and gNB during ... |
As a 5G mobile network engineer resolve the following issues. | Abnormal N26 interface interworking with high failure rate for 5G to 4G handovers and Context not found errors | Verify N26 interface configuration between AMF and MME; check UE context transfer procedure implementation; examine mapping between 5G and EPS security contexts; analyze QoS flow to EPS bearer mapping; verify APN to DNN conversion; check TAI to TAI mapping for inter-system handovers; examine combined registration proce... |
As a 5G mobile network engineer resolve the following issues. | Session management back-off timer excessively triggered for corporate APNs with high congestion control activation | Verify SMF dimensioning for corporate DNNs; check NSSAI capacity planning; examine PCF congestion control policies; analyze SMF overload control thresholds; verify UPF capacity for enterprise traffic; check back-off timer values configuration; examine load balancing across SMF instances; verify proper logging of conges... |
As a 5G mobile network engineer resolve the following issues. | Network slice specific authentication failures despite successful primary authentication | Verify slice specific authentication configuration; check Re-authentication indicator handling; examine NSSF slice selection function; analyze AAA server integration for enterprise slices; verify EAP-AKA' implementation; check secondary authentication procedure; examine slice specific credentials management; verify sec... |
As a 5G mobile network engineer resolve the following issues. | Frequent PDU session release with cause due to UE generated NAS signaling connection release for IoT devices | Check UE power saving mode configuration; verify extended DRX settings for IoT; examine session release timer settings; analyze keepalive mechanism implementation; verify TCP optimization for IoT traffic; check application behavior patterns; examine mobile terminated data handling; verify UPF buffering capabilities; an... |
As a 5G mobile network engineer resolve the following issues. | AMF overload procedure frequently triggered with overload reduction of 50% despite capacity planning | Verify AMF dimensioning calculations; check signaling load monitoring; examine NGAP overload start procedure implementation; analyze registration attempt distribution; verify load balancing across AMF set; check AMF profile configuration in NRF; examine overload control algorithms; verify AMF resource utilization monit... |
As a 5G mobile network engineer resolve the following issues. | Radio resource control connection resume failures with high latency before reject for inactive state UEs | Check RRC inactive state configuration; verify UE context retention timer; examine RNA configuration; analyze paging in RRC inactive state; verify resume identity allocation mechanism; check security context preservation; examine AS context management; verify cell reselection parameters for inactive mode; analyze UE me... |
As a 5G mobile network engineer resolve the following issues. | LADN service unavailability despite UE presence in LADN service area with correct DNN configuration | Verify LADN service area definition; check LADN information communication during registration; examine UE location tracking for LADN services; analyze LADN DNNs authorization in UDM; verify AMF tracking of UE presence in LADN service area; check SMF selection for LADN services; examine LADN service notification mechani... |
As a 5G mobile network engineer resolve the following issues. | Network triggered service request failures for mission critical services with high priority indicator | Check paging prioritization mechanism; verify QoS provisioning for mission critical services; examine ARP configuration; analyze pre-emption capability and vulnerability settings; verify resource allocation for high priority services; check slice specific resource allocation; examine maximum delay budgets application; ... |
As a 5G mobile network engineer resolve the following issues. | Frequent DRX configuration failures during RRC reconfiguration with UE reporting out of memory errors | Verify DRX parameter complexity; check UE capability handling for power saving features; examine RRC reconfiguration message size; analyze ASN.1 encoding efficiency; verify UE memory management for RRC messages; check RRC reconfiguration timing; examine power saving feature activation patterns; verify simultaneous feat... |
As a 5G mobile network engineer resolve the following issues. | SMF service not reachable when attempting PDU session establishment for specific S-NSSAI | Verify NRF service registration for SMF; check SMF instance health monitoring; examine SMF service authorization for slice; analyze SMF selection procedure; verify NSSF slice selection function; check DNS resolution for SMF services; examine SMF capacity for slice; verify AMF to SMF interface (N11) stability; analyze S... |
As a 5G mobile network engineer resolve the following issues. | UE reporting Temporarily not authorized for this SNPN despite valid credentials and subscription | Check SNPN access control configuration; verify subscription status for private network; examine authorization timer implementation; analyze CAG information in system information; verify UDM provisioning for private network access; check UE authorization status synchronization; examine temporary restriction functions; ... |
As a 5G mobile network engineer resolve the following issues. | Abnormal NAS signaling connection release immediately after security mode command acceptance | Verify NAS security algorithm compatibility; check UE security capability handling; examine integrity protection failure statistics; analyze security context establishment; verify key derivation functions; check SUPI/SUCI handling; examine authentication vector usage; verify NAS counter synchronization; analyze securit... |
As a 5G mobile network engineer resolve the following issues. | Emergency service fallback procedure failures with UEs unable to access emergency services in 5G coverage area | Verify emergency service fallback configuration; check emergency service support indication in registration accept; examine emergency service fallback IE in RRC release; analyze emergency service support in AMF; verify emergency slice configuration; check emergency call routing; examine emergency PDU session handling; ... |
As a 5G mobile network engineer resolve the following issues. | High rate of RAN-initiated PDU session release during handover with RAN status transfer not possible | Check Xn/N2 data forwarding configuration; verify QoS flow information during handover; examine uplink tunnel management; analyze data volume during handover; verify target gNB capacity for admission; check handover preparation phase timeout; examine RAN congestion status; verify proper handover cancellation procedures... |
As a 5G mobile network engineer resolve the following issues. | NAS transport failure with cause Payload was not forwarded for SMS over NAS despite SMSF registration | Verify SMSF selection and discovery process; check SMS capability registration; examine T3447 timer configuration; analyze NAS transport message handling; verify SMSF capacity and overload status; check SMS subscription data in UDM; examine SMS over NAS service authorization; verify SGs/SGd interface alternative routin... |
As a 5G mobile network engineer resolve the following issues. | Excessive Authentication failures with cause MAC failure during peak hours for specific tracking areas | Verify AUSF capacity during peak hours; check authentication vector generation in UDM; examine SEAF implementation in AMF; analyze key derivation procedures; verify NAS integrity algorithm selection; check UE security capability signaling; examine UDM/SIDF capacity; verify authentication procedure timeout handling; ana... |
As a 5G mobile network engineer resolve the following issues. | Frequent UE radio capability update needed indications causing additional signaling load after software updates | Verify UE radio capability handling procedure; check UE capability ID management; examine UE Radio Capability For Paging storage; analyze radio capability filtering function; verify UE capability version handling; check capability update triggering mechanism; examine incremental capability signaling possibilities; veri... |
As a 5G mobile network engineer resolve the following issues. | Network rejected PDU session establishment with SM cause insufficient user-plane resources at the UPF despite capacity planning | Verify UPF dimensioning for user plane traffic; check UPF selection mechanism; examine load balancing across UPF instances; analyze UPF user plane processing capacity; verify GTP-U tunnel establishment; check N4 interface PFCP association; examine resource reporting accuracy; verify SMF monitoring of UPF resources; ana... |
As a 5G mobile network engineer resolve the following issues. | PDU Session establishment request timeout with SMF reporting 'No response from UPF on N4 interface' | Investigate UPF connectivity and capacity. Check N4 interface logs for packet drops or routing issues. Verify UPF Sx heartbeat status. Examine SMF logs for specific N4 transaction IDs failing. Check UPF CPU and memory utilization. Perform packet capture on N4 interface to identify any malformed PFCP messages. If necess... |
As a 5G mobile network engineer resolve the following issues. | Multiple UEs experiencing PDU Session failures with error code 5GSM #28 'Unknown PDU session type' | Verify UE capability alignment with network configuration. Check if PDU session type in SMF configuration matches subscription data in UDM. Examine PCF policies for restrictions on PDU session types. Review SMF logs to determine if IPv4 IPv6 or Ethernet type sessions are failing. Update subscription data in UDM to supp... |
As a 5G mobile network engineer resolve the following issues. | Excessive PDU Session release events with cause 'UPF failure' occurring in specific tracking area | Investigate the specific UPF serving the tracking area. Check UPF hardware resources including CPU memory and network interface utilization. Examine UPF logs for N4 heartbeat failures or PFCP association breakdowns. Verify physical connectivity of UPF with connected network elements. Check for congestion patterns on N3... |
As a 5G mobile network engineer resolve the following issues. | PDU Session establishment failures with error 'QoS flow resource setup failure' in congested cells | Analyze RAN resources in the affected cells. Check RRC connection setup success rates and QoS flow setup statistics. Examine SMF logs for specific QoS parameters being rejected. Verify PCF policy alignment with RAN capabilities. Check for interference or coverage issues in the cell areas. Consider adjusting QoS paramet... |
As a 5G mobile network engineer resolve the following issues. | Sporadic 5GSM cause #27 'Missing or unknown DNN' errors despite correct APN configuration on devices | Examine UDM subscription data for affected subscribers. Verify DNN configurations in SMF and UDM match exactly including case sensitivity. Check DNS server responses for DNN resolution. Verify AMF is correctly passing DNN information to SMF. Examine if wildcarded DNNs are properly configured. Check PCF policies for DNN... |
As a 5G mobile network engineer resolve the following issues. | Bulk PDU Session failures following SMF software upgrade with error 'N4 context not found' | Rollback SMF to previous software version immediately if service impact is severe. Check SMF and UPF state synchronization mechanisms. Verify PFCP association status between SMF and UPF instances. Examine session restoration procedures during SMF restart. Analyze UPF logs for session teardown indications. Check databas... |
As a 5G mobile network engineer resolve the following issues. | Users reporting inability to access specific application servers after PDU Session establishment appears successful | Verify DNS resolution within the PDU session. Check UPF NAT functionality if employed. Examine UPF packet forwarding statistics. Verify correct UPF traffic steering configurations. Check application server IP reachability from UPF. Perform packet capture at UPF external interfaces to verify traffic flow. Examine PCC ru... |
As a 5G mobile network engineer resolve the following issues. | Increased latency in PDU Session establishment following network slice reconfiguration | Compare session establishment KPIs before and after reconfiguration. Check SMF processing delays for the affected network slice. Verify NRF discovery procedures for new slice configurations. Examine NSSF slice selection processes. Check SMF CPU and memory utilization patterns during session establishment. Verify databa... |
As a 5G mobile network engineer resolve the following issues. | 5GSM #36 'Regular deactivation' errors occurring sporadically for enterprise users during peak hours | Check UPF capacity and overload conditions during peak hours. Analyze session termination causes in SMF logs. Verify if PCF is triggering policy-based deactivations. Check for idle timeout configurations. Examine enterprise APN specific configurations. Monitor UPF packet processing performance. Check if session monitor... |
As a 5G mobile network engineer resolve the following issues. | PDU Session modification failures when attempting to apply QoS modification with error 'Policy and Charging control failure' | Investigate PCF connectivity and performance. Check N7 interface stability between SMF and PCF. Examine PCF policy decision logs for errors. Verify PCF is receiving appropriate subscription information from UDM. Check for policy conflict resolution in PCF. Examine SMF logs for specific policy enforcement failures. Veri... |
As a 5G mobile network engineer resolve the following issues. | Users experiencing secondary authentication failure during PDU Session establishment for private network access | Verify external AAA server connectivity from SMF. Check timeout configurations for authentication procedures. Examine RADIUS or Diameter server logs for failed authentication attempts. Verify correct mapping of IMS identities to usernames for authentication. Check credential configurations. Verify TLS certificates if u... |
As a 5G mobile network engineer resolve the following issues. | PDU Sessions failing with SMF reporting error 'UP resource allocation failure' for specific UPF | Check UPF resource utilization including user plane throughput and session count. Verify PFCP association status. Examine N4 resource allocation requests and responses with detailed packet capture. Check UPF capacity thresholds and current operating levels. Verify DSCP markings for control plane traffic to UPF. Review ... |
As a 5G mobile network engineer resolve the following issues. | Multiple PDU Session establishments failing with error 'Session context not found in SMF' after inter-AMF handovers | Examine SMF session persistence during mobility events. Check N11 interface messages between old and new AMF instances and SMF. Verify correct PDU Session ID handling during handover. Check SMF state database for corruption. Examine handover completion notifications. Verify timer configurations for session state preser... |
As a 5G mobile network engineer resolve the following issues. | PDU Session establishments consistently timing out for a specific network slice during maintenance window | Check if maintenance activities are affecting network functions serving the slice. Verify NRF registrations for network functions in that slice. Check NSSF slice selection and availability status. Examine SMF instance health serving that slice. Verify AMF to SMF communication for the specific slice. Check resource quot... |
As a 5G mobile network engineer resolve the following issues. | Users experiencing session drops with cause 'Network failure' when UPF load balancer failover occurs | Examine UPF load balancer redundancy configuration. Check session persistence mechanisms during failover events. Verify PFCP association recovery procedures. Check heartbeat mechanism between SMF and UPF cluster. Analyze transactional session state preservation during UPF switching. Reduce failover detection and switch... |
As a 5G mobile network engineer resolve the following issues. | N2 SMCM failure notifications occurring for PDU Session establishment with gNB reporting cause 'Transport resource unavailable' | Investigate transport network capacity between gNB and UPF. Check N3 tunnel establishment failures. Verify TEID allocation and GTP-U configurations. Examine QoS flow setup statistics in gNB. Check for transport congestion indicators in gNB metrics. Verify MTU settings across the transmission path. Check for any rate li... |
As a 5G mobile network engineer resolve the following issues. | PDU Session modification requests timing out when attempting to establish dedicated QoS flows | Check SMF processing of dedicated QoS flow establishment. Verify PCF policy decisions for dedicated flows. Examine N2 SM messages for QoS flow setup. Check gNB acknowledgment of QoS flow modifications. Verify UE capability to support multiple QoS flows. Check RAN conditions in serving cells. Examine SMF timeout configu... |
As a 5G mobile network engineer resolve the following issues. | Unable to establish PDU Sessions with SSC mode 3 with SMF reporting error 'UPF selection failure' | Verify UPF support for SSC mode 3 in NRF registrations. Check UPF selection policy in SMF for SSC mode 3 sessions. Ensure multiple UPFs are available for anchor and target roles. Verify PCF policy allows SSC mode 3 operation. Check SMF capability to orchestrate make-before-break session continuity. Examine UPF selectio... |
As a 5G mobile network engineer resolve the following issues. | PDU Session resource modify failure with gNB reporting cause 'Multiple PDU Session ID instances' | Check for PDU Session ID consistency across interfaces. Examine SMF session database for duplicate entries. Verify correct session release cleanup in previous sessions. Check AMF session context handling. Verify N2 SM message sequencing. Examine gNB session context handling logic. Check PDU Session ID allocation mechan... |
As a 5G mobile network engineer resolve the following issues. | Ethernet PDU Session establishment failures with SMF logging 'Unsupported PDU Session type in UPF' | Verify UPF capability to support Ethernet PDU Session types. Check NRF registration profile of UPF for Ethernet support. Examine UPF selection policy in SMF for Ethernet sessions. Verify PCF policies allow Ethernet type. Check UE subscription data in UDM for Ethernet session permissions. Examine N4 session establishmen... |
As a 5G mobile network engineer resolve the following issues. | PDU Session failure rate increased following network clock synchronization issue with error 'Invalid timestamp in SMF requests' | Verify NTP synchronization across all network functions. Check SMF system time and compare with other network elements. Examine timestamp fields in protocol messages. Verify security associations requiring timestamp validation. Check certificate validity periods. Restore correct time synchronization with gradual adjust... |
As a 5G mobile network engineer resolve the following issues. | Users experiencing intermittent connectivity in established PDU Sessions with UPF reporting GTP-U path failure | Perform GTP-U echo testing between UPF and gNB. Check transport network for packet loss or intermittent failures. Verify load balancing configuration for GTP traffic. Examine MTU settings across the path. Check for ECMP routing issues if present. Verify consistency of DSCP markings. Monitor GTP sequence number continui... |
As a 5G mobile network engineer resolve the following issues. | PDU Session establishment rejected with cause 'Insufficient user plane resources' despite low overall UPF utilization | Examine UPF resource allocation mechanisms. Check for resource fragmentation issues. Verify PFCP association status and reported available resources. Examine resource threshold configurations. Check for resource reservation policies that may limit available capacity. Verify correct resource reporting from UPF to SMF. E... |
As a 5G mobile network engineer resolve the following issues. | PDU Sessions failing specifically for emergency services with cause 'Restricted service area' | Verify emergency services configuration in SMF. Check PCF policies for emergency services. Verify UPF selection policy for emergency traffic. Examine AMF handling of emergency service indicators. Check location-based restrictions in serving network. Verify ARP settings for emergency service QoS flows. Check for regulat... |
As a 5G mobile network engineer resolve the following issues. | SMF reporting N4 session modification failures during UPF overload condition with error 'Request rejected' | Analyze UPF load patterns and identify overload triggers. Check UPF CPU memory and forwarding resource utilization. Verify UPF overload protection mechanism configuration. Examine PFCP overload indicators in messages. Implement traffic steering to alternate UPFs. Check session modification throttling mechanisms in SMF.... |
As a 5G mobile network engineer resolve the following issues. | PDU Session setup latency exceeding thresholds after introducing new PCF instance in the network | Measure PCF response times for policy decisions. Check SMF to PCF interface latency. Verify NRF discovery time for the new PCF. Examine PCF database query performance. Check PCF hardware resources and utilization. Verify PCF logging level is not causing performance degradation. Examine message sizes in policy responses... |
As a 5G mobile network engineer resolve the following issues. | IPv6 PDU Sessions failing with SMF error 'Cannot allocate IPv6 prefix' despite available address space | Check IPv6 address management database in SMF or external IPAM system. Verify UE addressing type support. Examine prefix delegation configurations. Check for prefix length misconfigurations. Verify DHCPv6 server functionality if used. Check for address pool fragmentation. Examine release timer configurations for IPv6 p... |
As a 5G mobile network engineer resolve the following issues. | UPF reporting GTP-U error indications for active PDU Sessions after serving gNB software upgrade | Verify GTP-U protocol compliance in upgraded gNB software. Check TEID handling and GTP header formatting. Examine packet captures on N3 interface. Verify sequence number handling. Check path management procedures. Verify MTU handling and fragmentation settings. Examine any GTP protocol extensions that might not be comp... |
As a 5G mobile network engineer resolve the following issues. | PDU Session establishments failing with PCF error 'User has no subscription for slice' despite correct slice configuration | Verify UDM subscription data for slice authorization. Check PCF policy decision logic for slice validation. Examine NSSF slice selection process. Verify AMF slice selection subscription data handling. Check SMF authorization with PCF for slice access. Examine NRF discovery with slice awareness. Verify UE slice configur... |
As a 5G mobile network engineer resolve the following issues. | Multiple UEs experiencing PDU Session failures with SMF reporting 'Incompatible QoS parameter combination' | Examine QoS parameter settings in PCF policies. Verify 5QI to QoS characteristics mapping in SMF. Check for invalid combinations of 5QI and ARP values. Verify UE QoS capabilities. Examine subscription data for QoS limitations. Check gNB supported QoS combinations. Verify SMF validation logic for QoS parameters. Update ... |
As a 5G mobile network engineer resolve the following issues. | PDU Session modification failing when attempting to add new QoS Flow with SMF error 'QoS monitoring not supported' | Verify UPF capability for QoS monitoring in NRF profile. Check SMF implementation of QoS monitoring procedures. Examine PCF policy regarding QoS monitoring requirements. Verify RAN support for QoS monitoring. Check UE capability for QoS monitoring reporting. Consider disabling QoS monitoring requirements in PCF tempora... |
As a 5G mobile network engineer resolve the following issues. | Roaming users unable to establish PDU Sessions with V-SMF reporting 'H-SMF selection failure' | Verify roaming architecture implementation. Check DNS or NRF resolution for H-SMF in home network. Examine SEPP configuration and security association status. Verify DNN to H-SMF mapping in home network. Check roaming agreement technical configurations. Examine N16 interface connectivity between V-SMF and H-SMF. Verify... |
As a 5G mobile network engineer resolve the following issues. | PDU Session resource setup failures with SMF error 'N2 SM information transfer failure' | Check N2 interface connectivity between AMF and gNB. Verify SCTP association status. Examine SMF to AMF communication on N11. Check NGAP message handling in AMF. Verify AMF overload status. Examine gNB processing of N2 SM messages. Check for message size limitations being exceeded. Verify proper encoding of SM informat... |
As a 5G mobile network engineer resolve the following issues. | UE reporting no data connectivity despite successful PDU Session establishment with SMF and UPF reporting normal status | Verify UE IP address allocation and acknowledgment. Check DNS server information provided to UE. Examine UPF forwarding plane configuration. Verify NAT functionality if applicable. Check IP routing from UPF to external networks. Perform data path testing from UPF external interfaces. Verify QoS enforcement not blocking... |
As a 5G mobile network engineer resolve the following issues. | PDU Session establishment failure rate increasing during busy hour with SMF error 'Session database connection timeout' | Check SMF database connection pool settings. Verify database server capacity and performance. Examine database query patterns from SMF. Check for long-running queries or transactions. Verify database connection timeout settings. Examine SMF retry mechanism for database operations. Check database server CPU memory and I... |
As a 5G mobile network engineer resolve the following issues. | PDU Session releases with cause 'Network failure' occurring after UPF VM live migration in cloud environment | Examine UPF state preservation during live migration. Check for packet loss during migration process. Verify PFCP association persistence. Check GTP-U path management during migration. Examine SMF detection and recovery from UPF temporary unavailability. Verify cloud infrastructure live migration settings. Check networ... |
As a 5G mobile network engineer resolve the following issues. | Local Area Data Network PDU Sessions failing with SMF reporting 'LADN service area unavailable' | Verify LADN service area definition in SMF. Check AMF tracking area to LADN service area mapping. Examine UE location information accuracy. Verify SMF processing of AMF provided location information. Check LADN DNS resolution. Verify UE is physically located within defined LADN service area. Update LADN service area co... |
As a 5G mobile network engineer resolve the following issues. | SMF unable to release PDU Sessions with error 'UPF not responding to session release request' | Check UPF reachability and health. Verify N4 interface status. Examine PFCP association state. Check for UPF overload condition. Examine UPF logs for specific session release processing errors. Verify SMF release retry mechanism. Check UPF resource utilization. Consider forced session cleanup in SMF if UPF remains unre... |
As a 5G mobile network engineer resolve the following issues. | PDU Session establishment failures with SMF reporting 'No response from UDM on Nudm_UECM interface' | Verify UDM connectivity and health. Check Nudm_UECM service registration in NRF. Examine SMF to UDM interface traffic. Check UDM overload status. Verify UDM database connectivity. Examine SMF retry mechanism for UDM communication. Check UDM capacity and performance metrics. Verify service-based interface configuration.... |
As a 5G mobile network engineer resolve the following issues. | Increased latency in PDU Session modification when applying UPF service function chaining | Examine service function chaining configuration in SMF. Verify UPF support for chaining functionality. Check latency between UPF and service functions. Examine packet processing delay in each service function. Verify N4 message processing for chaining updates. Check UPF hardware acceleration for service chaining. Optim... |
As a 5G mobile network engineer resolve the following issues. | PDU Sessions failing with SMF error 'UE subscription information not found' despite active authentication | Verify UDM subscription database status and synchronization. Check SMF to UDM interface for subscription data retrieval. Examine SUPI to subscription data mapping. Verify correct subscription identifiers in signaling. Check NRF discovery of UDM instances. Examine UDM database query performance. Verify UDM sharding or p... |
As a 5G mobile network engineer resolve the following issues. | PDU Session modification failing with PCF error 'Policy decision could not be enforced by UPF' | Examine specific policy parameters rejected by UPF. Verify UPF capability for requested policy enforcement. Check N4 protocol compliance for policy parameter encoding. Verify PCF policy decision alignment with UPF capabilities. Examine SMF processing of policy decisions before N4 conversion. Check UPF feature support i... |
As a 5G mobile network engineer resolve the following issues. | Users experiencing PDU Session failures when requesting specific S-NSSAI with SST value 3 | Verify network slice configuration for SST value 3. Check UDM subscription data for slice authorization. Verify NSSF slice selection policy. Examine SMF and UPF registration for the specific slice. Check PCF policy for slice access control. Verify slice resource quota allocation. Examine NRF discovery with slice filter... |
As a 5G mobile network engineer resolve the following issues. | PDU Session resource setup failures with gNB reporting cause 'Radio resources not available' | Analyze RAN congestion in affected cells. Check RRC connection and radio bearer statistics. Examine cell load balancing configuration. Verify QoS admission control settings in gNB. Check for radio resource competition from other slices. Examine PRB utilization patterns. Verify gNB resource allocation algorithm configur... |
As a 5G mobile network engineer resolve the following issues. | PDU Session establishment latency increasing after introducing edge computing UPF with SMF reporting slow N4 responses | Measure N4 transaction response times for edge UPF. Check network latency between SMF and edge UPF locations. Verify edge UPF processing capacity. Examine N4 message handling implementation in edge UPF. Check for resource contention in edge computing environment. Verify PFCP association health. Examine edge UPF logs fo... |
As a 5G mobile network engineer resolve the following issues. | PDU Session failures when attempting handover between 5G and 4G with cause 'Session continuity not supported' | Verify interworking function configuration between 5GC and EPC. Check session continuity mode in UE subscription data. Examine PDN connection parameters compatibility. Verify EPS bearer context creation during handover. Check for QoS parameter mapping between 5G and 4G systems. Examine APN to DNN mapping configuration.... |
As a 5G mobile network engineer resolve the following issues. | SMF reporting 'Protocol error unspecified' during PDU Session establishment for inbound roamers from specific PLMN | Capture detailed protocol traces between V-SMF and H-SMF. Verify protocol compatibility between roaming partners. Check for proprietary protocol extensions causing interoperability issues. Examine protocol message sequencing. Verify security parameters negotiation. Check IEs with encoding issues in protocol messages. E... |
As a 5G mobile network engineer resolve the following issues. | UPF reporting frequent user plane congestion with packet drops despite network capacity upgrades | Analyze traffic patterns and flow distribution. Check for microbursts causing buffer overflows. Verify traffic shaping and policing configuration. Examine QoS enforcement regarding scheduling and queuing. Check hardware buffer configurations. Verify equal load distribution across packet processing cores. Examine interf... |
As a 5G mobile network engineer resolve the following issues. | PDU Session failures with SMF error 'Maximum number of supported PDU Sessions per UE reached' despite low session count | Verify SMF configuration for maximum sessions per UE. Check UDM subscription limitations for concurrent sessions. Examine number of actual established sessions versus reported. Check for sessions stuck in release state. Verify AMF session context awareness. Examine proper session release procedures when sessions are te... |
As a 5G mobile network engineer resolve the following issues. | PDU Session modification rejections with SMF reporting 'QoS flow update failure' when attempting to modify guaranteed bitrate | Verify PCF policy decision for GBR parameters. Check UE subscription entitlement for requested GBR values. Examine RAN capability to support the requested GBR. Verify proper propagation of QoS parameters to RAN. Check UPF enforcement capability for GBR flows. Examine admission control decisions in RAN. Verify SMF valid... |
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