QUESTION: 13

Which of the following channels (signals) can be used for cell measurement in NR?

DM-RS
CSI-RS
PT-RS
SSB

Answer(s): A,B

Explanation:

1. DM-RS (Demodulation Reference Signals) are transmitted in the frequency domain, they are used to demodulate the downlink data and control channels, and they can be used for cell measurement such as cell identification, cell reselection, and handover. B. CSI-RS (Channel State Information Reference Signals) are also transmitted in the frequency domain, they are used to provide channel state information for downlink data and control channels, and they can be used for cell measurement such as link adaptation, beamforming and interference management. DM-RS stands for Demodulation Reference Signal and is used for channel estimation in the frequency domain. CSI-RS stands for Channel State Information Reference Signal and is used for channel estimation in the time-frequency domain. PT-RS and SSB are not channels (signals) that can be used for cell measurement in NR.

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QUESTION: 14

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

RLC layer
MAC layer
PDCP layer
Physical layer

Answer(s): B

Explanation:

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=080166e5a9 64aa85&appId=PPGMS
Preliminary results for multi-service support in link solution adaptation https://ec.europa.eu/research/participants/documents/downloadPublic?documentIds=080166e5a9 64aa85&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.

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QUESTION: 15

According to 3GPP specifications, which of the following is not an RRC state in 5G?

RRC_IDLE
RRC_ACTIVE
RRC_CONNECTED
RRC_INACTIVE

Answer(s): D

Explanation:

According to 3GPP specifications, the RRC states in 5G are RRCIDLE, RRCACTIVE, and RRCCONNECTED. RRCINACTIVE is not an RRC state defined in 3GPP specifications. RRCIDLE is the state when the UE is not attached to an eNB and is not actively monitoring for paging. RRCACTIVE is the state when the UE is attached to an eNB and is actively monitoring for paging. RRCCONNECTED is the state when the UE has an established RRC connection with an eNB. The RRC is a protocol that controls the radio resources of the mobile device in a cellular network. 3GPP (3rd Generation Partnership Project) has defined several RRC states for 5G NR (New Radio) to manage the radio resources of the mobile device. These states are:
1. RRC_IDLE: The mobile device is not connected to any cell and is not actively searching for a cell to connect to. B. RRC_ACTIVE: The mobile device is connected to a cell and is actively communicating with it. C. RRC_CONNECTED: The mobile device is connected to a cell, but it's not actively communicating with it. It is in a low power state and is only listening to the paging channel for incoming calls or data.
So, the correct answer is D. RRC_INACTIVE, is not an RRC state in 5G according to 3GPP specifications. It's worth noting that the RRC state of the mobile device can change dynamically based on the network conditions, service requirements, and the mobile device's power management.

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QUESTION: 16

Which of the following actions are involved in NAS procedure management in 5G? (Choose all that Apply)

Registration management
RRC reestablishment
Session management
RRC connection setup

Answer(s): A,C,D

Explanation:

NAS (Non-Access Stratum) procedure management in 5G involves three specific actions: registration management, session management, and RRC connection setup. Registration management involves sending and receiving of NAS messages related to the establishment of user-network connections, such as attach and detach procedures. Session management involves sending and receiving of NAS messages related to the management of user session related information, such as security context management. RRC connection setup involves sending and receiving of NAS messages related to the establishment, modification, and release of RRC connections. RRC reestablishment is not involved in NAS procedure management in 5G.
https://www.etsi.org/deliver/etsi_ts/138300_138399/138331/15.02.01_60/ts_138331v150201p.pdf TS 138 331 - V15.2.1 - 5G; NR; Radio Resource Control (RRC ... https://www.etsi.org/deliver/etsi_ts/138300_138399/138331/15.02.01_60/ts_138331v150201p.pdf https://scdn.rohde-
schwarz.com/ur/pws/dl_downloads/dl_application/application_notes/1sl/1SL368_0e_5G_NR_UE_R F_conformance_38.521-3.pdf
5g nr fr1 non-standalone ue rf conformance testing https://scdn.rohde-
schwarz.com/ur/pws/dl_downloads/dl_application/application_notes/1sl/1SL368_0e_5G_NR_UE_R F_conformance_38.521-3.pdf https://www.etsi.org/deliver/etsi_ts/138300_138399/138331/15.03.00_60/ts_138331v150300p.pdf TS 138 331 - V15.3.0 - 5G; NR; Radio Resource Control (RRC ... https://www.etsi.org/deliver/etsi_ts/138300_138399/138331/15.03.00_60/ts_138331v150300p.pdf

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QUESTION: 13

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QUESTION: 14

Explanation:

QUESTION: 15

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QUESTION: 16

Explanation: