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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: SRAN Performance Optimization Fundamentals | 25% | - Key performance indicators (KPIs) definition and measurement - Network performance monitoring and analysis tools - Performance optimization principles and methodology |
| Topic 2: Quality of Service and Resource Management | 15% | - QoS parameters, scheduling and admission control - Radio resource management and optimization |
| Topic 3: Coverage and Capacity Optimization | 30% | - Interference analysis and mitigation techniques - Capacity planning, load balancing and optimization - Coverage analysis, tuning and optimization |
| Topic 4: Mobility and Handover Optimization | 20% | - Mobility robustness and optimization - Handover parameters and algorithms - Inter-RAT mobility and optimization |
| Topic 5: Advanced Optimization and SON Features | 10% | - Energy saving and advanced features - Self-Organizing Networks (SON) use cases and optimization |
>> SRAN-Radio-Network-Performance-Optimization専門知識訓練 <<
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質問 # 28
Which of the following statements about CBRA , or contention-based random access , is correct?
正解：D
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 # 29
What is the mandatory prerequisite to implement DSS , or Dynamic Spectrum Sharing ?
正解：C
解説：
The correct answer is D .
DSS allows LTE and 5G NR to share the same spectrum dynamically , instead of requiring a separate dedicated NR carrier. Therefore, dedicated NR spectrum is not mandatory. DSS is also not limited to TDD only; it is commonly used in FDD spectrum refarming scenarios as well. Public RAN references describe DSS as a mechanism where LTE and NR coexist in the same frequency band and share spectrum dynamically.
From an SRAN architecture point of view, the mandatory deployment condition is that the radio platform must support LTE and NR coexistence on the same radio resources. That requires RF module sharing or a DSS-capable shared radio configuration.
So the correct prerequisite is:
RF module sharing.
質問 # 30
Which statement is not true about MantaRay SON ?
正解：A
解説：
The correct answer is B .
The statement "Energy savings management is not covered" is not true . Nokia describes MantaRay SON as supporting radio network performance, quality, and energy efficiency optimization. Nokia also references AI-powered energy savings management and RAN energy efficiency use cases under its SON/MantaRay automation portfolio.
The other statements are aligned with Nokia SON/MantaRay positioning. Nokia describes MantaRay SON as an automation layer within the MantaRay SMO framework, with support for multi-supplier/non-real-time RIC functionality and an application ecosystem. Nokia also has historical EdenNet SON material, including EdenNet SON Energy Saving Management.
Therefore, the statement that is not true is:
Energy savings management is not covered.
質問 # 31
Evaluate the impact of extended FR2 cell range on power consumption.
正解：D
解説：
The correct answer is C .
In FR2/mmWave , uplink coverage is often the limiting factor because UE transmit power is much lower than gNodeB transmit power, and mmWave propagation suffers from high path loss and blockage. Ericsson's mmWave coverage discussion also notes that high-band coverage is limited by uplink signal quality and high- band propagation characteristics.
When the FR2 cell range is extended, UEs farther from the serving cell must transmit uplink signals over a more difficult radio path. This usually requires higher UE transmit power, more robust MCS, more repetitions or retransmissions, and potentially longer uplink activity. As a result, UE battery consumption can increase.
Therefore, extended FR2 range generally:
Increases power consumption because UEs need more energy to transmit uplink signals.
質問 # 32
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 # 33
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