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Exam SRAN-Radio-Network-Performance-Optimization Topic 1 Question 8 Discussion

Actual exam question for Nokia's SRAN-Radio-Network-Performance-Optimization exam
Question #: 8
Topic #: 1
When selecting an LTE anchor layer for EN-DC , why is it important to check 3GPP band combinations ?

Suggested Answer: B Vote an answer

The correct answer is B .
In 5G NSA EN-DC , the UE connects to LTE as the Master Cell Group , or anchor, and NR as the Secondary Cell Group . Not every LTE band can be paired with every NR band. The supported LTE-NR combinations are defined by 3GPP band-combination rules and must also be supported by the UE chipset and device capability.
For example, an operator may have LTE Band 3, Band 7, or Band 20 and NR n78, but only certain LTE-NR combinations may be valid for EN-DC. If the selected LTE anchor band is not supported in combination with the NR band, the UE will not be able to establish EN-DC even if LTE and NR coverage both exist.
Option C is not correct because dual-uplink support depends on UE capability and specific band-combination support; it cannot be guaranteed for all UE models. Option A and D are unrelated to the main purpose of checking 3GPP band combinations.
So the correct reason is:
To ensure that LTE and NR bands are compatible and allowed as EN-DC pairs.

by Joy at Jul 10, 2026, 02:17 AM

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