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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Performance Troubleshooting | 20-25% | - Network failure identification and resolution - Common performance issues diagnosis - Optimization case studies - Root cause analysis methodologies - Troubleshooting tools utilization |
| Topic 2: Radio Network Optimization Techniques | 25-30% | - Handover optimization - Load balancing techniques - Coverage optimization methods - Capacity optimization strategies - Interference analysis and mitigation - Parameter tuning best practices |
| Topic 3: SRAN Optimization Tools and Reports | 10-15% | - Nokia NetAct and performance tools - Automated optimization features - Configuration management for optimization - Report generation and interpretation |
| Topic 4: SRAN Architecture and Fundamentals | 15-20% | - SRAN solution components and functions - SRAN network architecture overview - Radio access concepts and principles - Single RAN integration principles |
| Topic 5: Radio Network Performance Monitoring | 20-25% | - Performance monitoring tools and dashboards - Performance data collection and analysis - KPI definition and measurement - Real-time network monitoring techniques - Threshold configuration and alerting |
>> SRAN-Radio-Network-Performance-Optimization基礎問題集 <<
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質問 # 16
Which of the following statements about CBRA , or contention-based random access , is correct?
正解：B
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 # 17
Choose the correct statement from the options below.
正解：A
解説：
The correct answer is B .
Beamforming is mainly about shaping and directing radio energy toward a UE or a target area. It improves coverage, SINR, and cell-edge performance by focusing the transmitted or received signal in a specific direction.
MIMO , or Multiple Input Multiple Output , uses multiple antenna paths to improve throughput, reliability, and spectral efficiency. MIMO can be used for spatial multiplexing, diversity, or beamforming depending on the antenna system and radio configuration.
Option A is incorrect because beamforming and MIMO are related but not the same.
Option C reverses the definitions.
Option D is incorrect because beamforming and MIMO are commonly used together, especially in Massive MIMO systems.
So the correct statement is:
Beamforming focuses on directing the signal, while MIMO focuses on utilizing multiple paths for data transmission.
質問 # 18
A slice supporting sensors and smart meters would be categorized as:
正解：D
解説：
The correct answer is A .
Sensors and smart meters are typical massive IoT use cases. They usually involve a very large number of devices sending small amounts of data, often with low mobility and low power requirements.
This type of traffic fits mMTC , or massive Machine Type Communications .
Why the other options are not correct:
URLLC is used for very low-latency and highly reliable services, such as industrial automation, remote control, or mission-critical applications.
eMBB is used for high-throughput broadband services, such as video, fixed wireless access, or enhanced mobile internet.
DNN is not a slice category. It means Data Network Name and identifies the data network the UE connects to, similar to APN in LTE.
Therefore, a slice supporting sensors and smart meters is categorized as:
mMTC.
質問 # 19
Identify the missing network components X, Y, and Z in the architecture diagram.
正解：D
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 # 20
At which mark are all conditions fulfilled for energy saving , so the cell will be switched off? Refer to the image below.
正解：B
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 # 21
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