Huawei H35-480_V3.0 Exam - Topic 6 Question 63 Discussion

Actual exam question for Huawei's H35-480_V3.0 exam

Question #: 63
Topic #: 6

[All H35-480_V3.0 Questions]

At which layer is downlink data split implemented over the NR air interface in the NSA Option 3x architecture?

ARLC layer

BMAC layer

CPDCP layer

DPhysical layer

Show Suggested Answer

Suggested Answer: B

Downlink data split over the NR air interface in the NSA Option 3x architecture is implemented at the medium access control (MAC) layer. The MAC layer is responsible for the management of data transmission over the air interface, including segmentation and reassembly of data packets, scheduling of transmission resources, and error correction. The other layers (RLC, PDCP, and physical) are not involved in the implementation of downlink data split.

https://ec.europa.eu/research/participants/documents/downloadPublic?documentIds=080166e5a964aa85&appId=PPGMS

Preliminary results for multi-service support in link solution adaptation

https://ec.europa.eu/research/participants/documents/downloadPublic?documentIds=080166e5a964aa85&appId=PPGMS

https://ieeexplore.ieee.org/iel7/6287639/8948470/08998153.pdf

3GPP NR Sidelink Transmissions Toward 5G V2X

https://ieeexplore.ieee.org/iel7/6287639/8948470/08998153.pdf

https://www.3gpp.org/ftp/Inbox/Marcoms/ICT_6_1-2.pdf

journal of ict standardization - 3gpp

https://www.3gpp.org/ftp/Inbox/Marcoms/ICT_6_1-2.pdf

In the Non-Stand-Alone (NSA) Option 3x architecture, the control plane functions are handled by the 4G LTE network (EPC), while the user plane functions are handled by the 5G NR network. Data split is a technique that allows to split the user plane data between the 4G LTE and 5G NR networks.

The MAC (Medium Access Control) layer is responsible for controlling the access to the shared wireless medium, and it is where the downlink data split is implemented. In this architecture, the MAC layer in the 5G NR network receives the downlink data from the 4G LTE network and sends it to the physical layer for transmission.

by Eugene at Aug 01, 2025, 01:40 PM

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Melina

2 months ago

PDCP makes sense, but I was surprised to learn that!

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Avery

2 months ago

I thought it was the RLC layer, this is confusing.

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Peter

2 months ago

Wait, are we sure it's not the MAC layer?

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Ronald

2 months ago

Totally agree, PDCP is the right answer.

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Wayne

3 months ago

It's at the PDCP layer!

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Cammy

3 months ago

I have a vague memory of the Physical layer being involved, but that seems too low for data splitting.

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Luisa

4 months ago

I feel like it could be the RLC layer, but I might be mixing it up with something else we studied.

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Val

4 months ago

I remember practicing a question about the MAC layer, but I don't think that's where the split happens.

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Elliot

4 months ago

I think the downlink data split is handled at the PDCP layer, but I'm not entirely sure.

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Ma

4 months ago

I'm a little confused on this one. Is the downlink data split implemented at the RLC layer, the MAC layer, or the PDCP layer? I'll need to review my notes to refresh my memory on the NR protocol stack and where specific functionalities are handled.

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Mohammad

4 months ago

Okay, let me think this through step-by-step. The downlink data needs to be split and distributed across the 5G and LTE links, and that functionality is handled at a higher layer, not the physical layer. I believe it's the PDCP layer that's responsible for this in the NSA Option 3x architecture. I'm feeling confident about that.

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Edna

5 months ago

Hmm, I'm a bit unsure about this one. I know the different layers of the NR protocol stack, but I can't quite remember where the downlink data split happens. I'll have to think this through carefully.

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Curt

5 months ago

I'm pretty sure the downlink data split is implemented at the PDCP layer in the NSA Option 3x architecture, but I'll double-check the course materials to be sure.

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Kerry

5 months ago

The MAC layer seems more plausible, that's where the multiplexing and scheduling happens, right?

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Nell

2 months ago

Definitely! It handles the data flow efficiently.

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Natalie

2 months ago

I agree, the MAC layer is crucial for that.

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Dell

3 months ago

But what about the RLC layer? It plays a role too.

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Therese

3 months ago

True, but MAC is where the real action happens!

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Mattie

5 months ago

Ah, I see. Thanks for sharing that information. I'll keep that in mind for the exam.

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Mila

6 months ago

Sure! I read in my study materials that in NSA Option 3x architecture, the downlink data split is done at the PDCP layer to separate user data and control data.

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