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Nokia SRAN-Radio-Network-Performance-Optimization Exam Syllabus Topics:

SectionObjectives
Troubleshooting and Performance Analysis- Network issue identification and resolution
  • 1. Fault analysis workflows
    • 2. Performance degradation root cause analysis
      Radio Network Performance Fundamentals- Key performance indicators (KPIs)
      • 1. Accessibility, retainability, and mobility KPIs
        • 2. Throughput and latency KPIs
          LTE/NR Performance Optimization- Optimization techniques
          • 1. Handover optimization
            • 2. Scheduling and resource allocation optimization
              RF Optimization Principles- Coverage and capacity optimization
              • 1. Interference analysis and mitigation
                • 2. Coverage analysis and enhancement
                  SRAN Architecture Overview- SRAN network structure and components
                  • 1. Radio access network elements overview
                    • 2. LTE/NR integration principles

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                      Nokia MN: NCSS NPS - SRAN Radio Network Performance Optimization Certification Exam | GS40-NPS-SRPER-E-S03-2510 認定 SRAN-Radio-Network-Performance-Optimization 試験問題 (Q19-Q24):

                      質問 # 19
                      Which of the following statements about CBRA , or contention-based random access , is correct?

                      正解:A

                      解説:
                      The correct answer is B .
                      In contention-based random access , the UE chooses a random access preamble by itself from a configured pool of available contention-based preambles. This is typically used when the UE does not yet have a dedicated connection or when the network has not assigned a dedicated preamble.
                      Because multiple UEs may choose the same preamble at the same time, preamble collision is possible . That is why CBRA requires a contention resolution step.
                      Option C describes contention-free random access , not CBRA. In contention-free random access, the network assigns a dedicated preamble to the UE, so collision risk is avoided and contention resolution is not required.
                      Option A is not the correct CBRA principle being tested. RACH false detection can be a receiver/design issue, but it does not define the CBRA procedure.
                      Option D describes a possible NSA signaling behavior around access failure handling, but it is not the core correct definition of CBRA.
                      Therefore, the correct CBRA statement is:
                      The UE autonomously selects a preamble from the configured range and starts the random access procedure.


                      質問 # 20
                      The CB009425 feature provides several enhancements to improve the transmission link budget for VoNR, offering a better customer experience. Which statements are correct regarding this feature?

                      正解:H

                      解説:
                      The correct answer is D.
                      The feature is focused on improving VoNR link robustness and user experience, especially near the cell edge or in difficult RF conditions. VoNR is sensitive to packet loss, delay, and uplink coverage limitations.
                      Therefore, link-budget improvement features commonly target BLER behavior, transport block sizing, and MCS robustness.
                      Statement A is correct because minimizing Packet Loss Rate, or PLR, directly improves VoNR speech quality and reduces mute, clipping, or robotic voice effects.
                      Statement B is correct because VoNR bearers can use specific initial BLER targets. A more suitable BLER target helps the scheduler choose a more robust MCS for voice traffic.
                      Statement C is correct because a configurable uplink minimum TBS, or Transport Block Size, helps ensure that small VoNR packets are transmitted efficiently and reliably.
                      Statement D is correct because MCS downgrade control can improve robustness by selecting a more conservative modulation and coding scheme for VoNR DRBs when radio conditions require it.
                      Therefore, all listed enhancements are part of the VoNR link-budget improvement concept:
                      A, B, C, and D.


                      質問 # 21
                      At which mark are all conditions fulfilled for energy saving , so the cell will be switched off? Refer to the image below.

                      正解:C

                      解説:
                      The correct answer is B , which corresponds to mark C in the diagram.
                      In the diagram, the energy-saving process follows these stages:
                      Before mark B , the cell is entering the power-saving period, but the required load condition has not yet been satisfied for the required duration.
                      At mark B , the measured load has gone below the configured threshold, but the cell is not switched off immediately. The system must confirm that the load remains below the required threshold for the configured time.
                      At mark C , the load has stayed below the required threshold for the required duration, shown as 5 minutes in the diagram. At this point, all conditions are fulfilled, and the cell can be switched off. The diagram also shows the state becoming:
                      energySavingState = energySaving
                      Marks D and E are already inside or near the later part of the power-saving period. Mark E is associated with operator suspension/exit behavior, not the initial moment when all switch-off conditions are first fulfilled.


                      質問 # 22
                      Which of the following best describes one of the primary purposes of the Coverage and Quality use case?

                      正解:C

                      解説:
                      The correct answer is B .
                      The Coverage and Quality use case is used in network planning and optimization to identify RF problem areas. These may include:
                      Low RSRP or weak coverage areas
                      Poor SINR or low radio quality areas
                      High interference zones
                      Overshooting cells
                      Coverage holes
                      Areas where users experience poor throughput or poor accessibility
                      This type of use case helps NPO engineers prioritize optimization actions such as antenna tilt changes, azimuth changes, parameter tuning, neighbor optimization, power adjustment, or site expansion.
                      The other options are not the primary purpose:
                      VPN tunnel configuration is a connectivity/security task.
                      LCBIN-to-CSV conversion is a data processing task.
                      Replacing the Kronos parser is a tool-chain or troubleshooting function, not the main purpose of coverage and quality analysis.
                      So the best answer is:
                      To identify problem areas such as low coverage or high interference.


                      質問 # 23
                      Identify the missing network components X, Y, and Z in the architecture diagram.

                      正解:A

                      解説:
                      The correct answer is B .
                      In the 5G Core , component X is connected to:
                      N2 from NG-RAN
                      N11 toward SMF
                      N15 toward PCF
                      N26 toward the EPC mobility entity
                      These are typical interfaces of the AMF , or Access and Mobility Management Function . Therefore, X = AMF .
                      In the EPC , component Z is connected to:
                      S1-MME from eNB
                      S11 toward the gateway
                      N26 toward the 5GC AMF
                      These are typical interfaces of the MME , or Mobility Management Entity . Therefore, Z = MME .
                      Component Y is outside the core user-plane path and represents the external service network connected through N6/SGi , commonly shown as IMS in voice-service architecture diagrams. Therefore, Y = IMS .
                      So the correct mapping is:
                      X: AMF, Y: IMS, Z: MME.


                      質問 # 24
                      ......

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