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| Section | Weight | Objectives |
|---|---|---|
| SRAN Optimization Tools and Reports | 10-15% | - Report generation and interpretation - Nokia NetAct and performance tools - Automated optimization features - Configuration management for optimization |
| SRAN Architecture and Fundamentals | 15-20% | - SRAN network architecture overview - Radio access concepts and principles - Single RAN integration principles - SRAN solution components and functions |
| Performance Troubleshooting | 20-25% | - Common performance issues diagnosis - Troubleshooting tools utilization - Root cause analysis methodologies - Network failure identification and resolution - Optimization case studies |
| Radio Network Performance Monitoring | 20-25% | - Real-time network monitoring techniques - KPI definition and measurement - Threshold configuration and alerting - Performance data collection and analysis - Performance monitoring tools and dashboards |
| Radio Network Optimization Techniques | 25-30% | - Coverage optimization methods - Interference analysis and mitigation - Handover optimization - Load balancing techniques - Capacity optimization strategies - Parameter tuning best practices |
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問題 #28
What is the role of admission control in 5G networks ?
答案：A
解題說明：
The correct answer is D .
Admission control is responsible for deciding whether a new UE connection, bearer, service, or session can be accepted by the cell without negatively affecting existing users and services.
In 5G RAN, admission control checks available radio resources such as:
* PRB availability
* PDCCH/PUCCH capacity
* UE context capacity
* QoS requirements
* GBR or non-GBR bearer requirements
* Cell load and congestion status
It does not directly manage modulation schemes; that is handled by link adaptation. It also does not directly increase spectral efficiency or optimize downlink throughput, although good admission control indirectly protects user experience and avoids overload.
So the main role of admission control is:
To check whether there are enough resources for new connections.
問題 #29
Which parameter defines the PRACH format ?
答案：D
解題說明：
The correct answer is B .
The prachConfigurationIndex defines the PRACH configuration, including the PRACH time-domain occasions and the associated PRACH format according to the PRACH configuration tables. In 5G NR, PRACH configuration is based on 3GPP-defined PRACH tables, where the configuration index maps to the PRACH format and PRACH occasion structure.
The other options have different meanings:
A). msg1-FrequencyStart defines the frequency-domain starting position of PRACH occasion resources.
C). prachRootSequenceIndex defines the root sequence used for PRACH preamble generation.
D). totalNumberOfRAPreambles defines how many random access preambles are available.
Therefore, the parameter that defines the PRACH format is:
prachConfigurationIndex.
問題 #30
In a high-mobility network, the maximum cell size must be restricted to 33 km . Which PRACH format and restricted-set type should be used?
答案：B
解題說明：
The correct answer is Format 1 / Type B .
For PRACH planning, the selected preamble format must support the required cell radius. Format 0 is too short for a 33 km cell because it is typically suitable only up to around 14.5 km . Format 2 is also not suitable because its practical maximum cell radius is around 29.5 km , which is below the required 33 km . Therefore, a longer PRACH format is needed.
Because the scenario mentions high mobility , an unrestricted PRACH set is not preferred. High-mobility environments require a restricted set to handle Doppler effects and reduce ambiguity in PRACH preamble detection. Between the restricted-set options, Type B is the correct choice for this 33 km high-mobility case.
A matching Nokia-style question source also lists this exact scenario with Format 1 / Type B as option A.
問題 #31
In NR SA Option 2, the UE is camped on an SA serving cell. An IRAT handover is triggered for a multi-QCI call, QCI 1 and QCI 6, due to weak coverage of the serving cell. What will happen to both QCIs during the IRAT handover toward LTE?
答案：B
解題說明：
The correct answer is D.
In 5G SA Option 2, NR works independently with the 5G Core, but interworking with LTE/EPC can be supported for mobility continuity. When IRAT handover toward LTE is triggered due to weak NR coverage, the goal is to preserve the active services during mobility.
For a multi-QCI service:
QCI 1 normally represents the voice bearer, such as VoLTE/IMS voice continuity after movement to LTE.
QCI 6 normally represents a non-GBR data bearer.
During a supported IRAT handover from NR SA to LTE, both the voice bearer and data bearer can be transferred to LTE, assuming proper interworking, bearer mapping, and LTE coverage availability.
Option C is incorrect because IRAT mobility from NR SA to LTE is supported in properly configured networks. Option A is incorrect because the voice bearer is the most critical bearer to preserve. Option B is also not the best answer because the data bearer does not necessarily need to be released during IRAT handover.
Therefore, the expected result is:
Both QCI 1 voice and QCI 6 data continue on LTE.
問題 #32
Which of the following statements about CBRA , or contention-based random access , is correct?
答案：B
解題說明：
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.
問題 #33
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