5G NBIOT LTE Question Answers
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Home LTE NB-IoT 5G(NR-NSA) In this article, we will learn the basics of DC Carrier and why it is needed. Why in NR, DC subcarrier is not reserved like LTE? With legacy LTE (4G) it was decided that all devices (UE) should be capable of the maximum carrier bandwidth of 20MHz (UE can also support 10/15/5/3 MHz). This was a reasonable assumption at the time given the relatively modest bandwidth compared to NR, Whereas NR is designed to support very wide bandwidths up to 400MHz (for FR2) and 100Mhz (for FR1) for a single carrier. As well as NR supports multiple numerologies on the same transmitted carrier frequency. It is not necessary that all devices can support up to 400 MHz Bandwidth, hence in NR BWP concept is introduced. (To learn more about BWP Click here ). Note: in the above and below NR case figur... Read more 
Home LTE NB-IoT 5G(NR-NSA) Hi Guys today we are learning about 5G deployment options, if you want to know more about other 5G deployment option please click here Option 3: EN-DC (EUTRA-NR Dual Connectivity) Option 3 represents a network having both LTE and NR radio access, but using only the EPC core of LTE to route the Control signals. In this option, LTE is used as the control plane anchor for NR, and both LTE and NR are used for user data traffic.(user plane). It could also be called as Non-Standalone (NSA) NR in Evolved Packet System. The only difference between Options 3 and 3A is based on whether the user plane data is sent to NR directly or via the LTE RAN. This standardization was concluded in 3GPP Rel-15. This is a possible first step in the migration towards 5G-SA. This option wi... Read more 
Home LTE NB-IoT 5G(NR-NSA) Hi Guys today we are learning about 5G deployment options, if you want to know more about other 5G deployment option please click here Option 7: Deployment Option 7 represents a deployment scenario in which the Next Generation Core (NGC) will be used with a mixture of LTE and NR radio. Next Generation signaling will be used but it will be routed via the LTE RAN because the LTE network is more fully built out and thus more reliable for handling signaling. Options 7 and 7a differ on whether the user plane data is sent to NR directly or via the LTE RAN. 7/7A/7X require an eLTE upgrade of the existing LTE network at the start. (Difference is UP path Non Standalone ( Dual Connectivity 4G/5G ) Option 7/7A: NSA NR in 5GS. This option is particularly a... Read more 
Home LTE NB-IoT 5G(NR-NSA) In this section we will learn about PRACH Preamble Format and its basics as well as interview questions. Random access with NR supports different PRACH formats and numerologies to cope up with different deployments. The random access sequences themselves are based on the preamble format. Preamble Format: (Qus: How many new preamble format are introduce by 3gpp in NSA or SA case?) In 5G NSA or SA cases, there are 13 types of preamble format for FR1/FR2 and they are known as Format 0/1/2/3, Format A1/A2/A3, Format B1/B2/B3/B4, Format C0/C2. These 13 types of preamble format can be categorized into two categories: • Sequence length of L = 139, with subcarrier spacing of 15, 30, 60, and 120 kHz. These can be solutions for different coverage situations. • Sequence length of L ... Read more 
Home LTE NB-IoT 5G(NR-NSA) As per readers request this article is based on some 5G abbreviations (PCell,spCell,Scell,PSCell,MCG.SCG,Master-Node,Secondary-Node) for better understanding. What is Master Node? Master node: The node (radio access node) that provides the control plane connection to the core network in case of multi radio dual connectivity (MR-DC). For example, it can be master eNB in EN-DC, a Master ng-eNB in NGEN-DC What is Secondary Node? Secondary node: the radio access node, with no control plane connection to the core network, providing additional resources to the UE in case of MR-DC. For example, It may be an en-gNB in EN-DC or a Secondary ng-eNB (in NE-DC). What is MCG? MCG: Master Cell group It is a group of serving cells associated with the Maste... Read more 
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5G
Basic Of 5G:- 5G Basic PART I
- 5G Basic PART II ( Key performance requirements)
- 5G Basic PART III(Use Cases of 5G)
- MCG,SCG,PCell.PSCell,spCell,SCell,CellGroupID,spCellConfig,ServCellIndex (Definitions)
- FR1 and FR2 band list (NRARFCN table)
- DC Carrier in NR
- DC Carrier in NR part 2 (interview QUS and ANS)
- 5G Deployment Option1
- 5G Deployment Option2
- 5G Deployment Option-3/3a/3x
- 5G Deployment Option-4/4a
- 5G Deployment Option-5
- 5G Deployment Option-6
- 5G Deployment Option-7/7a/7x
- 5G Deployment Option-8/8a
- 5G Deployment Scenarios
- Type of Dual Connectivity
- 5G Flexible Numerology
- Carrier Aggregation & Dual Connectivity
- Carrier Aggregation Part-1( interview questions and answers)
- Carrier Aggregation Part-2 (interview questions and answers)
- SRB BasicPart-1 (SRB0,SRB1,SRB2,SRB3 and interview Question)
- SRB BasicPart-2 (SRB0,SRB1,SRB2,SRB3 and interview Question)
- SRB BasicPart-3 (SRB0,SRB1,SRB2,SRB3 and interview Question)
- 5G CORESET Part-1
- Why PHICH and PCFICH channel is not present in NR (5G)?
- BWP Part-1
- BWP Part-2 BWP in SA and NSA
- Types of BWP in SA and NSA Case
- AI-5G Introduction Part-1
- AI-5G Introduction Part-2
- SSB Basic Part-1
- SSB Basic Part-2 (5g & 4g synchronization process, pci in 5g, basic of ssb)
- Reference Signal Part-1 (Basic of RS)
- Reference Signal Part-2 (DMRS, SRS,TRS)
- Reference Signal Part-3 (PTRS,CSI-RS)
- PRACH Part-1 (Basic, LTE interview QUS and ANS)
- PRACH Part-2 (Basic when does UE need to perform RACH in NR/LTE case)
- PRACH Part-3 (Preamble Formats)
- Beamforming Part-1 (Basic, beamforming interview QUS and ANS)
- Beamforming Part-2 (Beamforming benefits are obtained in practice with massive MIMO antennas)
- Beamforming Part-3 (Digital and Analogue domain Beamforming benefits)
- Cell Selection Part-1 (Basic, Cell selection interview QUS and ANS for SA and LTE)
- Cell Selection Part-2 (Cell selection criteria interview QUS and ANS for SA and LTE)
- HARQ Part-1 (Basic, HARQ, ARQ interview QUS and ANS for SA and LTE)
- DSS Part-1 (Basic of DSS)
- DSS Part-2 (DSS interview QUS and ANS for SA and LTE)
- DSS Part-3
Comments
Umang20 March 2019 at 05:22Nice briefing,
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- Anupam22 March 2019 at 09:58
Good one !
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Unknown19 January 2020 at 20:53Nicely explained
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- Unknown30 January 2020 at 20:52
You have any information of how AMF decode number of bits present in nrcellid which consists of variable gnb id and variable cell I'dThanks in advance
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- Anonymous6 February 2020 at 21:45
How is voice handled in 5G. Can you provide details on EPS fallback procedure and Voice over NR procedure.
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Blacktechoguys21 February 2020 at 07:50Sure, we will write article on EPS Fallback and IRAT Fallback........
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- Gokulnath27 February 2020 at 21:24
Waiting for detailed 5G registration process and call flow process
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- Anonymous29 March 2023 at 00:45
Good one !
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- 923875701021 June 2024 at 19:18
5G
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- 923875701021 June 2024 at 19:19
vivo
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Umang
Unknown
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cell selection part-1
Home LTE NB-IoT 5G(NR-NSA) In this section, we will learn about cell selection basics for SA and LTE. What is cell selection? If a device is under circumstances where UE needs to be switched on or after UE has left RRC connected mode or UE returns to a coverage area, it sees many base stations around it. Many a times UE might be surrounded by multiple base stations from different operators. So from this many base stations, UE can register to only one cell. So to register to a specific cell UE goes through a dedicated process. This specific decision making process where UE decides to which cell to camp on is known as cell selection. Is the initial cell selection procedure reacquired in the case of NSA ? When UE is connected to MCG that time only cell selection procedure is reacquired. Note: ENDC cel... Read moreDC Carrier in NR
Home LTE NB-IoT 5G(NR-NSA) In this article, we will learn the basics of DC Carrier and why it is needed. Why in NR, DC subcarrier is not reserved like LTE? With legacy LTE (4G) it was decided that all devices (UE) should be capable of the maximum carrier bandwidth of 20MHz (UE can also support 10/15/5/3 MHz). This was a reasonable assumption at the time given the relatively modest bandwidth compared to NR, Whereas NR is designed to support very wide bandwidths up to 400MHz (for FR2) and 100Mhz (for FR1) for a single carrier. As well as NR supports multiple numerologies on the same transmitted carrier frequency. It is not necessary that all devices can support up to 400 MHz Bandwidth, hence in NR BWP concept is introduced. (To learn more about BWP Click here ). Note: in the above and below NR case figur... Read more 5G Deployment Option-3/3a/3x
Home LTE NB-IoT 5G(NR-NSA) Hi Guys today we are learning about 5G deployment options, if you want to know more about other 5G deployment option please click here Option 3: EN-DC (EUTRA-NR Dual Connectivity) Option 3 represents a network having both LTE and NR radio access, but using only the EPC core of LTE to route the Control signals. In this option, LTE is used as the control plane anchor for NR, and both LTE and NR are used for user data traffic.(user plane). It could also be called as Non-Standalone (NSA) NR in Evolved Packet System. The only difference between Options 3 and 3A is based on whether the user plane data is sent to NR directly or via the LTE RAN. This standardization was concluded in 3GPP Rel-15. This is a possible first step in the migration towards 5G-SA. This option wi... Read more 5G Deployment Option-7/7a/7x
Home LTE NB-IoT 5G(NR-NSA) Hi Guys today we are learning about 5G deployment options, if you want to know more about other 5G deployment option please click here Option 7: Deployment Option 7 represents a deployment scenario in which the Next Generation Core (NGC) will be used with a mixture of LTE and NR radio. Next Generation signaling will be used but it will be routed via the LTE RAN because the LTE network is more fully built out and thus more reliable for handling signaling. Options 7 and 7a differ on whether the user plane data is sent to NR directly or via the LTE RAN. 7/7A/7X require an eLTE upgrade of the existing LTE network at the start. (Difference is UP path Non Standalone ( Dual Connectivity 4G/5G ) Option 7/7A: NSA NR in 5GS. This option is particularly a... Read more PRACH Basic-3
Home LTE NB-IoT 5G(NR-NSA) In this section we will learn about PRACH Preamble Format and its basics as well as interview questions. Random access with NR supports different PRACH formats and numerologies to cope up with different deployments. The random access sequences themselves are based on the preamble format. Preamble Format: (Qus: How many new preamble format are introduce by 3gpp in NSA or SA case?) In 5G NSA or SA cases, there are 13 types of preamble format for FR1/FR2 and they are known as Format 0/1/2/3, Format A1/A2/A3, Format B1/B2/B3/B4, Format C0/C2. These 13 types of preamble format can be categorized into two categories: • Sequence length of L = 139, with subcarrier spacing of 15, 30, 60, and 120 kHz. These can be solutions for different coverage situations. • Sequence length of L ... Read more 5G abbreviations
Home LTE NB-IoT 5G(NR-NSA) As per readers request this article is based on some 5G abbreviations (PCell,spCell,Scell,PSCell,MCG.SCG,Master-Node,Secondary-Node) for better understanding. What is Master Node? Master node: The node (radio access node) that provides the control plane connection to the core network in case of multi radio dual connectivity (MR-DC). For example, it can be master eNB in EN-DC, a Master ng-eNB in NGEN-DC What is Secondary Node? Secondary node: the radio access node, with no control plane connection to the core network, providing additional resources to the UE in case of MR-DC. For example, It may be an en-gNB in EN-DC or a Secondary ng-eNB (in NE-DC). What is MCG? MCG: Master Cell group It is a group of serving cells associated with the Maste... Read more Reference signals Part-2
Home LTE NB-IoT 5G(NR-NSA) In this section, we will learn about the different reference signals. Now in order to keep the transmissions contained within a slot without having to depend on other slots and beams as well as to increase the protocol efficiency NR introduces the following reference signals:- (QUS: what are the types of reference signals in NR (5G)?) Demodulation reference signal (DMRS) Sound reference signal (SRS) Tracking reference signal (TRS) Phase tracking reference signal (PTRS) Channel state information reference signal (CSI-RS) Why are reference signal required? RS are required for the demodulation of user data and channel estimation. The reference signal transmission frequency is adaptive in NR. DMRS : (QUS: What is DMRS?) ... Read more
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[DOC] 3GPP TS 38.331
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NRDC - BAOMOI.COM