SSB GSCN is the center frequency number of an NR cell.
A
Explanation:
SSB GSCN is the center frequency number of an NR cell. SSB GSCN stands for "SS block group-specific
cell number" and is used to identify the center frequency of an NR cell. This value is used in
combination with the operating bandwidth of the cell to determine the physical layer resource grid
for the cell. As such, it is important for the correct SSB GSCN to be configured for the cell in order to
ensure the correct channel coding.
https://www.qualcomm.com/content/dam/qcomm-martech/dm-
assets/documents/powerpoint_presentation_-_making_5g_nr_a_reality_february_2020_web.pdf
Making 5G NR a Commercial Reality A unified, more capable 5G air ...
https://www.qualcomm.com/content/dam/qcomm-martech/dm-
assets/documents/powerpoint_presentation_-_making_5g_nr_a_reality_february_2020_web.pdf
https://www.gtigroup.org/d/file/Resources/rep/2019-07-
05/cbf7810256b4c312c460863fcb77bd58.pdf
GTI 5G Device Power Consumption White Paper
https://www.gtigroup.org/d/file/Resources/rep/2019-07-
05/cbf7810256b4c312c460863fcb77bd58.pdf
In 5G NR, the SSB (Secondary Synchronization Signal Block) is used to provide the time and
frequency synchronization information to the mobile devices. It is transmitted in the frequency
domain and it consists of two parts: the SSB GSCN (Secondary Synchronization Signal Block - Group
and Sequence Number) and the SSB MIB (Secondary Synchronization Signal Block - Master
Information Block).
The SSB GSCN is a unique identifier that indicates the center frequency number of the cell. It is used
to identify the cell and to determine the frequency offset of the cell with respect to the carrier
frequency.
So, the statement is true, SSB GSCN is the center frequency number of an NR cell. It's worth noting
that the SSB MIB contains other system information such as the system bandwidth, the transmission
bandwidth configuration, and the number of symbols in a slot.
Which of the following NR slot configurations are defined in 3GPP specifications? (Choose All that
Apply)
ABCD
Explanation:
1. Mixed slot is a slot configuration in which at least one downlink/uplink symbol is present, while
other symbols can be flexibly configured for downlink or uplink transmission. This allows for a more
efficient use of resources and better support for different types of services. B. Flexible-slot is a slot
configuration in which all symbols are flexibly configured for downlink or uplink transmission. This
allows for a more efficient use of resources and better support for different types of services. C.
Downlink-only slot is a slot configuration in which all symbols are dedicated for downlink
transmission, This configuration is mainly used for downlink-centric services such as video streaming
or software downloads. D. Uplink-only slot is a slot configuration in which all symbols are dedicated
for uplink transmission, this configuration is mainly used for uplink-centric services such as voice calls
or video conferencing.
Which of the following channels (signals) can be used for cell measurement in NR?
AB
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.
At which layer is downlink data split implemented over the NR air interface in the NSA Option 3x
architecture?
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.
According to 3GPP specifications, which of the following is not an RRC state in 5G?
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.
Which of the following actions are involved in NAS procedure management in 5G? (Choose all that
Apply)
ACD
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
Which type of information about NR cells is carried in the neighboring NR cell MRs reported by UEs?
(Choose all that Apply)
AC
Explanation:
1. RSRP (Reference Signal Received Power) is the power level of the reference signals received from
the cell, it is used to measure the strength of the signal from the cell, and it is an important
parameter for cell selection and handover decisions. C. PCI (Physical Cell Identity) is a unique
identifier assigned to each cell in the network, it is used to identify the cell and its system
information.
Which of the following functions are implemented by the UBBP board in the BBU5900? (Choose all
that Apply)
AD
Explanation:
1. The UBBP board in the BBU5900 provides CPRI (Common Public Radio Interface) ports for
communication with RF (Radio Frequency) modules. CPRI is an interface standard that is used to
transfer baseband signal data between the BBU and the RF modules. D. The UBBP board also
processes uplink and downlink baseband signals. This includes signal demodulation, decoding, and
modulation, as well as error correction, signal filtering, and other signal processing functions.
What is the maximum number of PCIs supported by a 5G network?
A
Explanation:
https://www.5gworldpro.com/blog/2020/11/11/what-is-difference-between-pci-in-4g-lte-and-pci-
in-5g-nr/
The maximum number of PCIs (Physical Cell Identifiers) supported by a 5G network is 1008. This is
specified in 3GPP 5G standard TS 38.211, which states that the maximum number of PCIs that a 5G
network can support is 1008.
In 5G, each cell is assigned a unique identifier called the PCI (Physical Cell Identity). The PCI is used to
identify the cell and its system information, and it is used for various purposes such as cell selection,
handover, and interference management.
According to 3GPP specifications, the maximum number of PCIs that can be supported by a 5G
network is 1008, which allows for a large number of cells to be deployed in a network. However, the
actual number of PCIs used in a network will depend on the specific deployment scenario, the
network architecture, and the capacity requirements of the network.
If multiple IP addresses are planned for a gNodeB and the next-hop IP addresses are different, which
of the following route configurations is more suitable?
C
Explanation:
In a gNodeB (generic NodeB), the routing table is used to determine the next-hop IP address for a
given destination IP address. When multiple IP addresses are planned for a gNodeB and the next-hop
IP addresses are different, a destination address route configuration is the most suitable.
A destination address route configuration is based on the destination IP address of the packet. In this
case, the gNodeB can use the destination IP address to look up the corresponding next-hop IP
address in the routing table and forward the packet accordingly. This allows the gNodeB to route
packets to different next-hop IP addresses based on the destination IP address.
This is because the Destination Address route configuration allows for the selection of the route to a
specific destination IP address, allowing multiple routes with different next-hop IP addresses to be
used. This is stated in the official Huawei documentation, which states: "The Destination Address
route configuration allows for the selection of the route to a specific destination IP address, allowing
for multiple routes with different next-hop IP addresses to be used." Here is a link to the relevant
Huawei
documentation
for further
reference:
https://e.huawei.com/en/products/base-
station/bbu5900/overview