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| Section | Objectives |
|---|---|
| 5G Fundamentals | - 5G network architecture and key concepts - 5G NR principles and key technologies |
| Radio Network Planning (RNP) | - Site selection and parameter planning - Capacity planning and dimensioning - Coverage planning principles |
| Radio Network Optimization (RNO) | - Coverage and interference optimization - Mobility optimization (handover, cell reselection) - KPI monitoring and analysis |
| 5G Performance and Troubleshooting | - Fault diagnosis and optimization methods - Drive test and data analysis |
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NEW QUESTION # 51
In cases where the same devices are used, which of the following link budget parameters may differ depending on use in either densely populated urban areas or rural areas? (Select All that Apply)
Answer: A,B,D
Explanation:
The link budget parameters that may differ depending on use in either densely populated urban areas or rural areas are area coverage rate, shadow fading margin, and penetration loss. The area coverage rate is the percentage of area within a cell that can receive a signal above a certain threshold. In densely populated urban areas, the area coverage rate may be lower than in rural areas due to more interference and obstacles. The shadow fading margin is an additional margin added to the link budget to account for the variation of signal strength due to obstacles in the propagation path. In densely populated urban areas, there may be more buildings and structures that cause shadow fading than in rural areas, so a larger shadow fading margin may be needed. The penetration loss is the loss of signal strength when it passes through walls or windows into buildings. In densely populated urban areas, there may be more indoor users than in rural areas, so a larger penetration loss may be considered. The antenna gain is not a parameter that depends on use in either densely populated urban areas or rural areas. It is a parameter that depends on the antenna design and configuration, which are usually fixed for a given system.
NEW QUESTION # 52
What are characteristics of eCPRI links?(Select All that Apply)
Answer: A,C,D
Explanation:
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.
NEW QUESTION # 53
As long as the SSB frequency or SCS between the serving cell and the neighboring cell is different, the terminal's measurement of the neighboring cell is an inter-frequency measurement.
Answer: B
Explanation:
If either the Synchronization Signal Block (SSB) frequency or the Subcarrier Spacing (SCS) differs, the measurement is treated as an inter-frequency measurement.
NEW QUESTION # 54
On a 5G network, the NAS layer uses 5G-GUTI to replace IMSI as the temporary ID of a UE for security reasons.
Answer: B
Explanation:
Explanation
According to the 5G-GUTI - 5G Globally Unique Temporary Identity, the NAS layer uses 5G-GUTI to replace IMSI as the temporary ID of a UE for security reasons. The 5G-GUTI is allocated by the AMF (Core Access and Mobility Management Function) at the time of network registration, and it is composed of the GUAMI (Globally Unique AMF ID) and the 5G-TMSI (5G Temporary Mobile Subscriber Identity).
NEW QUESTION # 55
In NSA networking, which of the following methods can be used to support X2 interconnection between an eNodeB and a gNodeB?(Select All that Apply)
Answer: C,D
Explanation:
Explanation
According to the 5G EN-DC Architecture and Interfaces, there are two methods that can be used to support X2 interconnection between an eNodeB and a gNodeB in NSA networking:
Interconnection through CI interfaces on the UMPT boards in different subracks: The UMPT is a universal main processing and transmission unit that provides main processing and transmission functions for a subrack. The UMPT has two CI interfaces that can be used for X2 interconnection with other base stations. The CI interfaces support CPRI, OBSAI, and eCPRI protocols and can use optical fibers or electrical cables for transmission. The CI interfaces can be configured as master or slave interfaces depending on the network topology.
IPRAN interconnection between subracks: IPRAN is an IP-based radio access network that uses IP transport technologies to carry base station traffic over Ethernet or MPLS networks. IPRAN can support X2 interconnection betweendifferent base stations by using IP routers or switches. IPRAN can provide flexible networking, high bandwidth, low latency, and high reliability for X2 interconnection.
The other two methods are not valid for X2 interconnection between an eNodeB and a gNodeB:
Interconnection via backplane in a subrack: This method is only applicable for X2 interconnection between two eNodeBs or two gNodeBs that are installed in the same subrack. The backplane is the internal bus that connects different boards within a subrack. The backplane supports CPRI, OBSAI, and eCPRI protocols and can provide high-speed data transmission between boards.
Interconnection through HEI interfaces on the UBBP boards in different subracks: This method is not supported by Huawei base stations. The HEI interface is a high-speed Ethernet interface that is used for data transmission between base stations and core networks or transport networks. The HEI interface supports S1, Xn, F1, E1, and N2 protocols and can use optical fibers or electrical cables for transmission. The HEI interface cannot be used for X2 interconnection between base stations.
Therefore, the correct answer is A and D.
NEW QUESTION # 56
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