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| Section | Weight | Objectives |
|---|---|---|
| 5G Radio Network Basics | 20% | - Overview of 5G Basic Signaling Process - 5G Physical Layer - 5G Network Architecture and Interface - 5G Overview |
| 5G Radio Network Basic Feature | 20% | - 5G NR Scheduling Feature - 5G NR Power Control Feature - 5G NR Mobility Management Feature - NSA Networking Based on EPC Feature - 5G MIMO Feature - Uplink Fallback to LTE |
| 5G Base Station Basic Operation | 10% | - Huawei 5G Base Station Product Overview - 5G Base Station Basic Operation |
| 5G Network Planning Basics | 20% | - 5G Wireless Network Coverage and Capacity Estimation - 5G Site Survey and Planning - 5G Site Solution Overview |
| 5G Network Testing and Optimization | 30% | - Radio Network Performance Management Basics - Analysis of 5G Radio Network Coverage Problems - 5G Network Test and Problem Analysis |
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質問 # 24
Which of the following materials does not need to be prepared before site survey?
正解：D
解説：
Explanation
According to the 5G Site Survey Guide (V1.0) (PDF)-EN, the engineering file is not a material that needs to be prepared before site survey. The engineering file is a document that records the site survey results and the design plan for the site. The engineering file is generated after the site survey is completed and approved by the customer. The materials that need to be prepared before site survey are:
Local map: A map of the area where the site is located, showing the roads, buildings, landmarks, and other features. The local map helps the site survey team to plan the route, identify the site location, and evaluate the surrounding environment.
Site survey table: A table that lists the items and parameters that need to be checked and measured during the site survey, such as antenna installation space, equipment room space and load bearing capacity, power supply, grounding, lightning protection, cable routing, etc. The site survey table helps the site survey team to conduct a comprehensive and systematic inspection of the site conditions and record the data.
5G antenna height table: A table that shows the recommended antenna height for different scenarios and frequency bands based on empirical data and theoretical calculations. The 5G antenna height table helps the site survey team to determine the optimal antenna installation height for achieving the best coverage and performance.
Therefore, the correct answer is D.
質問 # 25
What are characteristics of eCPRI links?(Select All that Apply)
正解：A、B、D
解説：
Explanation
According to the eCPRI Specification V2, eCPRI links have the following characteristics:
They require clock synchronization: eCPRI links use Ethernet as the transport layer, which does not provide inherent synchronization. Therefore, eCPRI links require external clock synchronization methods, such as IEEE 1588v2 Precision Time Protocol (PTP) or Synchronous Ethernet (SyncE).
They are based on the IP mechanism: eCPRI links use IP as the network layer, which provides routing and addressing functions for eCPRI messages. eCPRI links can use either IPv4 or IPv6 protocols.
They require AAU support: eCPRI links connect between Radio Equipment Control (REC) and Radio Equipment (RE) in a base station. AAU (Active Antenna Unit) is a type of RE that integrates RF and antenna functions in one unit. Therefore, eCPRI links require AAU support to enable flexible functional split options and reduce fronthaul bandwidth requirements.
eCPRI links are not based on the TDM mechanism because they do not use fixed time slots to transmit data.
Instead, they use variable-length packets to transmit data according to different service requirements.
質問 # 26
In the MR-DC architecture, which of the following factors affect the data split on a base station?(Select All that Apply)
正解：A、C、D
解説：
Explanation
According to the 5G-NR (EN-DC) Bearer Concept, in MR-DC (Multi-Radio Dual Connectivity) architecture, data split on a base station can be affected by the following factors:
PDCP layer buffer: The PDCP layer buffer stores user plane data before sending it to lower layers. The buffer size and occupancy can affect how data is split between LTE and NR bearers.
X2 latency: The X2 latency is the delay between LTE and NR base stations over the X2 interface. The X2 latency can affect how data is split between LTE and NR bearers by causing reordering or duplication of packets.
Air interface latency: The air interface latency is the delay between base stations and user equipment over the air interface. The air interface latency can affect how data is split between LTE and NR bearers by causing reordering or duplication of packets.
The RLC layer buffer does not affect data split on a base station because it is located below the PDCP layer where data split occurs.
質問 # 27
Which of the following events is used by the gNodeB to trigger a blind redirection procedure?
正解：B
解説：
Explanation
According to the Blind handover or blind redirection method and system, A3 is the event that is used by the gNodeB to trigger a blind redirection procedure. A3 is defined as "neighbour becomes offset better than serving" in 3GPP TS 38.331. When the gNodeB detects that the UE's signal quality on a neighbouring cell is better than that on the serving cell by a certain offset, it can initiate a blind redirection procedure to switch the UE to the neighbouring cell without requiring measurement reports from the UE.
質問 # 28
Imbalanced terminal receiving antennas will affect RANK performance. Generally, within what range can the average RSRP difference of different antennas be considered balanced?
正解：B
解説：
An antenna RSRP difference within 6 dB is generally considered acceptable for maintaining balanced MIMO performance and achieving expected Rank performance.
質問 # 29
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