1

참고 답변

Contention resolution ensures only one UE succeeds when multiple use the same preamble.

2

참고 답변

Inter-frequency measurements use measurement gaps to monitor other frequencies.

3

참고 답변

A paging message alerts a UE in idle mode about incoming data or calls.

4

참고 답변

I have extensive experience with OSPF, EIGRP, and BGP, having implemented and optimized these protocols in various enterprise environments. For instance, I successfully configured BGP for a multi-homed network to ensure redundancy and load balancing.

5

참고 답변

A point to point link is a connection between two dedicated networking devices. The complete bandwidth of the link is utilized for the transmission of data between two devices. There may be multiple connections between devices. Using a PPP link, two different networks can be connected, where one network will work as the endpoint for another. These days PPP links are created using modems and PSTN (Public Switched Telephone Networks). An example of a PPP link is a telephone call between two people.

6

참고 답변

CQI reports downlink channel quality to the eNodeB for adaptive modulation and coding.

7

참고 답변

Security in LTE is based on

8

참고 답변

I approach network capacity planning by analyzing current network usage and performance metrics, projecting future growth, and identifying potential bottlenecks. This involves monitoring traffic patterns, evaluating bandwidth requirements, and assessing the scalability of existing infrastructure. Based on the analysis, I develop a plan that includes upgrading hardware, optimizing configurations, and implementing additional resources to ensure the network can handle future demands.

9

참고 답변

The air interface in 5G introduces advanced QoS management mechanisms, including dynamic QoS allocation, traffic prioritization, and policy-based resource allocation, to ensure optimal service performance and user experience.

10

참고 답변

DCI formats include Format 0 (uplink grant), Format 1/1A/1B/1C/1D (downlink assignments), Format 2/2A/2B/2C (MIMO), Format 3/3A (power control), and Format 4 (uplink MIMO).

11

참고 답변

This question assesses the candidate's proficiency with tools like Ekahau, AirMagnet, Wireshark, or Cisco Prime for monitoring and analyzing wireless networks.

12

참고 답변

A default gateway routes traffic from a local network to external networks like the internet.

13

참고 답변

PSS and SSS help the UE identify the cell and achieve time/frequency synchronization.

14

참고 답변

A UE initiates RACH for initial access, handover, or when uplink synchronization is lost.

15

참고 답변

Transmission power control adjusts UE or eNodeB power to maintain signal quality and reduce interference.

16

참고 답변

A candidate's strategy for ensuring the quality and performance of a 5G system will test their commitment to delivering excellence and their overall understanding of setting and measuring performance metrics.

17

참고 답변

Here is our example response: "I always strive to adapt my communication style to match the knowledge level of the person I'm speaking with, whether it's a colleague or a client. I do my best to employ simple terms and easy-to-understand language when conversing with individuals outside the networking domain. I often use analogies when translating complicated topics to people, as I find this approach makes things simpler for others to grasp intricate ideas."

18

참고 답변

QoS in 5G ensures that different applications and services receive the required level of performance, such as latency, throughput, and reliability, based on their specific requirements.

19

참고 답변

The DRX inactivity timer starts after a data transmission, keeping the UE awake until expiry.

20

참고 답변

Network slicing is a key feature of 5G architecture that allows network operators to divide the network into virtualized slices, each with its own unique characteristics and capabilities. This allows operators to tailor the network to specific use cases and applications.

21

참고 답변

5G NR logical channels include BCCH, PCCH, CCCH, DCCH, DTCH, and MCCH.

22

참고 답변

A VPN is a Virtual Private Network. It creates a secure path over the internet, like a tunnel, to connect to a remote server.

23

참고 답변

RNTI is used for UE identification in 5G NR. Types include C-RNTI (cell-level), RA-RNTI (random access), TC-RNTI (temporary), P-RNTI (paging), SI-RNTI (system info), MCS-C-RNTI (MCS), CS-RNTI (configured scheduling), and INT-RNTI (interruption).

24

참고 답변

Analyzing network traffic patterns requires using tools like Wireshark, NetFlow analyzers, or network management software. With the help of software, network engineers: Collect and examine data on traffic volume, flow, sources, and destinations; Look for trends, spikes, or irregularities in the data; Use this analysis to identify potential issues and optimize performance.

25

참고 답변

This layer ensures reliable data transfer between devices on the same network segment. It organizes data into frames and checks for errors using techniques like MAC addressing.

26

참고 답변

This question evaluates the candidate's honesty and proactive approach to personal and professional development.

27

참고 답변

This question tests the candidate's ability to handle high-pressure situations independently, showcasing their problem-solving skills and resourcefulness. You'll also understand more about their practical knowledge and experience in diagnosing and resolving critical network issues. Answer sample: In the event of a major outage where routers within the network are unreachable and the escalation engineer is not available, the immediate response is critical to minimizing impact and restoring service. The initial step involves attempting to diagnose the scope and scale of the problem using available monitoring tools and systems. This includes checking network management systems (NMS) for alerts or indicators of what might have caused the outage, such as power failures, network congestion, or security incidents. Without access to the escalation engineer, the next step would involve following the established incident management protocol. This typically includes informing the relevant stakeholders about the incident, including management and affected departments, to ensure transparency and initiate contingency plans if necessary. Concurrently, I would attempt to isolate the issue by checking any recent changes to the network configuration or updates that might have triggered the outage. Leveraging the collective knowledge and resources of the team is crucial, so I would reach out to other team members or departments that might offer insights or have experienced similar issues. In parallel, accessing backup communication channels or secondary control systems that might not be affected by the outage could provide an alternative way to diagnose or even resolve the issue. Documentation plays a crucial role in such situations. I would document all actions taken and findings, as this information can be critical for post-mortem analysis and preventing similar issues in the future. If the primary methods of resolution are exhausted without success, activating disaster recovery plans, such as switching to backup systems or rerouting traffic through alternate pathways, becomes necessary to maintain business operations.

28

참고 답변

Random access preambles initiate the random access procedure.

29

참고 답변

MCS determines the data rate and robustness of HARQ transmissions.

30

참고 답변

Our team faced a critical network outage affecting multiple departments. I coordinated with colleagues to systematically isolate the issue, ultimately identifying a misconfigured router. Together, we resolved the problem within hours, restoring full network functionality.

31

참고 답변

The MME sends a paging message to eNodeBs in the tracking area.

32

참고 답변

Continuity is maintained via data forwarding and bearer transfer between eNodeBs.

33

참고 답변

LTE technology supports packet based services only, however 3GPP does specifies fallback for circuit switched services as well. To achieve this LTE architecture and network nodes require additional functionality, this blog is an attempt to provide overview for same. In LTE architecture, the circuit switched (CS) fallback in EPS enables the provisioning of voice and traditional CS-domain services (e.g. CS UDI video/ SMS/ LCS/ USSD). To provide these services LTE reuses CS infrastructure when the UE is served by E UTRAN.

34

참고 답변

5G incorporates secure network slicing techniques, including isolation mechanisms, encryption, and access control, to ensure the security and privacy of each network slice and prevent unauthorized access or data leakage.

35

참고 답변

5G network deployment involves meticulous planning, site preparation, equipment installation, and optimisation. The process encompasses radio access network deployment, core network integration, and thorough testing to ensure seamless connectivity and optimal performance.

36

참고 답변

Inter-frequency measurements evaluate signal quality on different carrier frequencies.

37

참고 답변

Contention resolution resolves collisions when multiple UEs use the same preamble.

38

참고 답변

IPv4 uses 32-bit addressing and supports around 4.3 billion addresses. IPv6 uses 128-bit addressing, providing an almost unlimited number of IP addresses and improving network scalability and efficiency. IPv4 uses decimal notation, while IPv6 uses hexadecimal notation. IPv4 uses broadcast traffic; IPv6 replaces it with multicast and anycast for efficiency. IPv6 has a simplified header structure, enabling more efficient routing. IPv6 supports auto-configuration (SLAAC), reducing the need for DHCP. IPv6 has built-in support for IPsec, improving native network security.

39

참고 답변

Handover call flow: Source gNB sends measurement control -> UE reports -> Source gNB decides handover -> Sends Handover Request to target gNB -> Target gNB admits -> Source gNB sends RRC Reconfiguration to UE -> UE synchronizes to target -> UE sends RRC Reconfiguration Complete -> Target gNB sends Path Switch Request to AMF/UPF -> UPF switches path -> Source gNB releases resources. SN status transfer involves transferring PDCP sequence numbers for data continuity.

40

참고 답변

Here you can list any qualifications or certifications youâve gained on your network engineering journey, whether through university degrees, network engineering courses or an apprenticeship course youâve completed. Although you may put all this down on your CV, this network engineer question allows you to expand on the qualifications youâve achieved, why you enrolled on these courses, and what you learned.

41

참고 답변

Deploying a 5G system necessitates knowledge and hands-on experience. The candidate's response will provide the hiring manager with an understanding of their deployment skills in a real-world scenario.

42

참고 답변

5G uses advanced technologies such as millimeter waves, massive MIMO, beamforming, and small cell networks.

43

참고 답변

The MME (Mobility Management Entity) handles signaling for mobility, session management, authentication, and tracking area updates in the LTE core network.

44

참고 답변

The MIB includes downlink bandwidth, PHICH configuration, and SFN bits.

45

참고 답변

UL (Uplink) is transmission from UE to eNodeB, while DL (Downlink) is transmission from eNodeB to UE.

46

참고 답변

5G NR (New Radio) is the new air interface developed by 3GPP for the 5G network. It uses a much wider spectrum than 4G, allowing higher throughput and more reliable connections. It also incorporates advanced technologies such as Massive MIMO, beamforming, and Full Duplex.

47

참고 답변

Link

48

참고 답변

Troubleshooting can be an important part of your daily workload as a network engineer when finding and diagnosing equipment that might not work properly. You may have to track down hardware issues, software bugs, and even security problems quickly and professionally. So, it's important that you can explain your process for identifying issues and resolving them efficiently and accurately.

49

참고 답변

NAS Idle state means the UE is registered but not actively connected, monitoring paging.

50

참고 답변

The paging occasion is the specific subframe where the UE wakes up for paging.

51

참고 답변

A single segment of UTP cable has an effective length of 90 to 100 meters. This limit can be overcome by using repeaters and switches.

52

참고 답변

5G NR (New Radio) has been developed to operate in two distinct bands; radioWave sub-6 GHz, and mmWave 24GHz to 52GHz. Despite actually running into the 7 GHz band, FR1 continues to be commonly referred to as the "Sub-6 GHz" band. FR1: 410 to 7125 MHz FR2: 24250 to 52600 MHz Each band may operate in either FDD or TDD duplex mode. Reference: (3GPP 38.104-5.2.1 FR1), (3GPP 38.104-5.2.2 FR2)

53

참고 답변

DCI includes the MCS field, which specifies the modulation order and coding rate for data transmission, adapting to channel conditions.

54

참고 답변

A stateful firewall monitors the state of active connections and makes decisions based on the context of traffic. This ensures a more dynamic and intelligent filtering process. A stateless firewall, on the other hand, filters packets based solely on predefined rules, without considering the state of the connection. It is faster but less sophisticated.

55

참고 답변

Transmission Mode 4 is closed-loop spatial multiplexing, using UE feedback for precoding.

56

참고 답변

Here's an appropriate response: "Network topology refers to the organisation of components within a communication network. This structural representation illustrates nodes, devices, and network connections, which can be physically or logically arranged to demonstrate their interrelationships. For example, in a mesh topology, every device within the network is directly interconnected with each other device, creating a comprehensive and redundant network structure. As a result, every device in the mesh topology must possess a minimum of two network connections to facilitate seamless communication and ensure reliable data transmission. Engineers can design and optimise networks by understanding topology to efficiently meet their intended purposes."

57

참고 답변

- RSRP / RSRQ / SINR - DL/UL Throughput - BLER - Latency - PRB utilization - Beam failure rate - Handover success rate - Connection setup success rate

58

참고 답변

Key aspects of 5G deployment include network controlled and UE controlled handovers, use of MIB (Master Information Block) and SIB (System Information Block) blocks, and non-standalone and standalone deployment modes.

59

참고 답변

This question evaluates the candidate's awareness of typical configuration errors, such as improper channel planning, security misconfigurations, or poor placement of access points.

60

참고 답변

I handle network compliance audits and assessments by preparing comprehensive documentation, conducting internal reviews, and ensuring all security controls and policies are in place. During the audit, I work closely with auditors to provide necessary information and address any findings promptly. Continuous monitoring and regular internal assessments help maintain compliance and readiness for external audits.

61

참고 답변

Guard time accommodates propagation delay, with larger cells requiring longer guard time.

62

참고 답변

A backbone network serves as the core framework within a computer network, linking together various networks. It facilitates the flow of information across different Local Area Networks (LANs) or subnetworks, ensuring seamless communication between them. A backbone manages the bandwidth and multiple channels. It also can tie together diverse networks in the same building, different buildings, and even in wide areas. Normally, the backbone's capacity is greater than the networks connected to it.

63

참고 답변

The downlink assignment index indicates the number of PDCCH assignments for HARQ-ACK bundling.

64

참고 답변

Handover involves measurement reporting, handover decision, preparation, execution, and completion.

65

참고 답변

An uplink grant is a DCI message that assigns PUSCH resources to a UE.

66

참고 답변

Extended PHR includes power headroom for multiple carriers in CA.

67

참고 답변

Contention-free RACH uses dedicated preambles for fast and reliable handover access.

68

참고 답변

âA router is a hardware component responsible for facilitating communication between various networks and devices. The key functions of a router encompass managing interactions between distinct networks, determining the optimal paths for device communication, as well as forwarding and filtering packets to ensure efficient data transmission.â

69

참고 답변

EN-DC (E-UTRA-NR Dual Connectivity) is a technology used in 5G networks that allows for simultaneous connections to both 4G and 5G networks.

70

참고 답변

This question will give an insight into the candidate's familiarity with cloud technologies and their experience integrating them with the 5G network.

71

참고 답변

The E-UTRAN (Evolved UTRAN) consists of eNBs, providing the E-UTRA user plane (PDCP/RLC/MAC/PHY) and control plane (RRC) protocol terminations towards the UE. The eNBs are interconnected with each other by means of the X2 interface. The eNBs are also connected by means of the S1 interface to the EPC (Evolved Packet Core), more specifically to the MME (Mobility Management Entity) by means of the S1-MME and to the Serving Gateway (S-GW) by means of the S1-U.

72

참고 답변

PRACH uses 6 resource blocks in the frequency domain, mapped to the configured offset.

73

참고 답변

The preamble itself carries no data; it identifies the UE via dedicated assignment.

74

참고 답변

A PDSCH resource assignment allocates specific RBs and MCS for downlink data.

75

참고 답변

The control plane comprises control functions and protocols responsible for signaling, session management, mobility management, and connection establishment between the UE and the network.

76

참고 답변

MIB error checking uses CRC to ensure correct decoding.

77

참고 답변

Detach terminates the UE's network connection, releasing resources and bearers.

78

참고 답변

LAN stands for Local Area Network and it refers to the connection that exists between computers and other network devices located in a small physical location. WAN, on the other hand, stands for Wide Area Network and refers to a telecommunications network (or computer network) that extends over a large geographical distance.

79

참고 답변

MAC schedules data transmission by allocating resources and managing HARQ.

80

참고 답변

Experience in project management, especially for 5G projects, can be a valuable metric to determine the candidate's leadership skills and ability to manage resources effectively.

81

참고 답변

I take a multi-layered approach to network security, including: - Implementing firewalls and intrusion detection/prevention systems - Segmenting networks using VLANs and access control lists - Encrypting sensitive data in transit and at rest - Regularly updating and patching systems - Conducting security audits and vulnerability assessments - Implementing strong authentication mechanisms - Educating users about security best practices

82

참고 답변

Ultra-Reliable Low Latency Communications (uRLLC) is a critical aspect of 5G NR, catering to applications with stringent requirements. uRLLC ensures ultra-reliable and low-latency communication, making it indispensable for applications demanding instantaneous response times, such as industrial automation, remote surgery, and mission-critical services. Its high reliability sets the stage for revolutionary advancements in various industries.

83

참고 답변

5G KPIs (Key Performance Indicators) are categorized according to the use cases: eMBB, URLLC, and mMTC. Common KPIs include: - Peak data rate - Peak spectral efficiency - Latency - Traffic capacity - Connection density - Energy efficiency - Reliability

84

참고 답변

The answer to this question will allow you to gain insight into the candidate's ability to develop a comprehensive migration plan that aligns with organizational objectives and manage technical complexities related to network architecture, security, and performance optimization. Answer sample: To migrate data center resources to the cloud while ensuring business continuity, I would adopt a systematic approach focused on thorough planning, risk mitigation, and effective execution. Firstly, I would conduct a comprehensive assessment of the current infrastructure, identifying workloads suitable for migration based on factors such as data sensitivity and performance requirements. Next, I would develop a detailed migration plan, outlining specific steps, timelines, and resource allocation while also considering potential risks and mitigation strategies. Throughout the migration process, I would prioritize minimizing disruption to operations by implementing phased migrations, conducting thorough testing, and establishing rollback procedures as needed. Post-migration, I would monitor the performance of cloud-based resources closely, optimize configurations, and regularly review disaster recovery and business continuity plans to maintain resilience.

85

참고 답변

SON (Self-Organizing Networks) includes ANR (Automatic Neighbor Relation) for automatic neighbor list management and MRO (Mobility Robustness Optimization) for optimizing handover parameters to reduce ping-pong, RLF, and handover failures.

86

참고 답변

PCFICH indicates the control region size, enabling PDCCH decoding.

87

참고 답변

Technologies used in 5G include millimeter waves and massive MIMO.

88

참고 답변

PDCCH carries DCI to schedule uplink and downlink data transmissions for UEs.

89

참고 답변

Ensuring isolation between network slices is crucial for preventing interference and maintaining service quality. Network slicing achieves isolation through dedicated resources and logical separation. Each slice operates independently, with its own set of resources, ensuring that changes or issues in one slice do not impact the performance or security of others.

90

참고 답변

I handle network capacity planning by analyzing current usage patterns and forecasting future demands to ensure scalability. For performance optimization, I regularly monitor key metrics and implement adjustments to maintain optimal network efficiency.

91

참고 답변

PHICH Ng (duration) is configured via MIB as normal or extended.

92

참고 답변

SRS is used for uplink channel quality estimation, enabling frequency-domain scheduling and timing alignment.

93

참고 답변

Error detection uses CRC, with NACK triggering retransmission.

94

참고 답변

A router is a layer three network device that is used to establish communication among different networks. It has four main roles that are: Inter-network communication, best path selection, packet forwarding, and packet filtering. Regarding the best path selection, there are three primary parameters: - Longest prefix match - Minimum AD (administrative distance) - Lowest metric value

95

참고 답변

The eNodeB does not send contention resolution, and the UE retries RACH.

96

참고 답변

STP (Spanning Tree Protocol) is a network protocol used to prevent loops in Ethernet networks with redundant links. It works by creating a spanning tree topology that disables redundant paths and ensures a loop-free network. STP dynamically detects and blocks redundant links while maintaining backup paths in case of link failures. This improves network reliability and prevents broadcast storms.

97

참고 답변

HARQ combines FEC and retransmissions to correct errors, improving reliability.

98

참고 답변

Many employers will want you to have either some experience or awareness of all aspects of network engineering. So, when answering this question, mention all the areas of network engineering you have knowledge and experience in and your preferred area you specialise in. Hereâs how you could respond: âWhile I find every aspect of being a network engineer enjoyable, there is one particular area where my passion and expertise truly shine when I interact with clients and support with troubleshooting their server issues. I love the challenge of dealing with server and configuration problems and coming up with solutions that allow the client to get the most out of the network theyâre using.â

99

참고 답변

The cyclic prefix mitigates ISI and ICI by providing a guard interval between symbols.

100

참고 답변

Multicast is a communication method where data is transmitted from one source to multiple destinations simultaneously. It is used in networking to efficiently deliver data, such as video streams or real-time updates, to multiple recipients without duplicating the data for each recipient. Multicast reduces network bandwidth usage and improves performance for applications that require simultaneous data delivery to multiple users.

101

참고 답변

PRACH spacing (1.25 kHz) is smaller than UL data spacing (15 kHz).

102

참고 답변

The following are LTE Interfaces : (Ref: TS 23.401 v 841) - S1-MME :- Reference point for the control plane protocol between E-UTRAN and MME. - S1-U:- Reference point between E-UTRAN and Serving GW for the per bearer user plane tunnelling and inter eNodeB path switching during handover. - S3:- It enables user and bearer information exchange for inter 3GPP access network mobility in idle and/or active state. - S4:- It provides related control and mobility support between GPRS Core and the 3GPP Anchor function of Serving GW. In addition, if Direct Tunnel is not established, it provides the user plane tunnelling. - S5:- It provides user plane tunnelling and tunnel management between Serving GW and PDN GW. It is used for Serving GW relocation due to UE mobility and if the Serving GW needs to connect to a non-collocated PDN GW for the required PDN connectivity. - S6a:- It enables transfer of subscription and authentication data for authenticating/authorizing user access to the evolved system (AAA interface) between MME and HSS. - Gx:- It provides transfer of (QoS) policy and charging rules from PCRF to Policy and Charging Enforcement Function (PCEF) in the PDN GW. - S8:- Inter-PLMN reference point providing user and control plane between the Serving GW in the VPLMN and the PDN GW in the HPLMN. S8 is the inter PLMN variant of S5. - S9:- It provides transfer of (QoS) policy and charging control information between the Home PCRF and the Visited PCRF in order to support local breakout function. - S10:- Reference point between MMEs for MME relocation and MME to MME information transfer. - S11:- Reference point between MME and Serving GW. - S12:- Reference point between UTRAN and Serving GW for user plane tunnelling when Direct Tunnel is established. It is based on the Iu-u/Gn-u reference point using the GTP-U protocol as defined between SGSN and UTRAN or respectively between SGSN and GGSN. Usage of S12 is an operator configuration option. - S13:- It enables UE identity check procedure between MME and EIR. - SGi:- It is the reference point between the PDN GW and the packet data network. Packet data network may be an operator external public or private packet data network or an intra operator packet data network, e.g. for provision of IMS services. This reference point corresponds to Gi for 3GPP accesses. - Rx:- The Rx reference point resides between the AF and the PCRF in the TS 23.203. - SBc:- Reference point between CBC and MME for warning message delivery and control functions.

103

참고 답변

Chase Combining retransmits the same coded data, and the receiver combines them for better decoding.

104

참고 답변

Four protocols are managed by this layer: ICMP, IGMP, IP, and ARP.

105

참고 답변

The LTE protocol stack includes PHY, MAC, RLC, PDCP, RRC, and NAS layers.

106

참고 답변

I placed point-of-sale devices in an isolated VLAN with ACLs blocking internet except payment gateways, meeting PCI compliance. That business alignment is key for strong network engineer interview questions responses.

107

참고 답변

A VPC is a logically isolated section of a public cloud where you can launch resources in a virtual network you define. It's important because it provides network isolation, security, and control over network configuration. This allows organizations to create a private and secure environment. They can achieve this within a public cloud infrastructure.

108

참고 답변

The transition from earlier generations to 5G RAN entails significant advancements. Notably, 5G delivers substantially higher data rates, offering faster downloads and reduced latency for an enhanced user experience. The ultra-low latency of 5G is pivotal for applications requiring real-time responsiveness, such as autonomous vehicles. Additionally, 5G RAN accommodates a greater number of connected devices per unit area, addressing the escalating demand for the Internet of Things (IoT) and facilitating a more interconnected environment. The introduction of network slicing is a distinctive feature, allowing the creation of virtual networks tailored to specific applications and ensuring efficient resource allocation. Moreover, the incorporation of advanced antenna technologies like massive MIMO enhances spectral efficiency.

109

참고 답변

Signal detection uses reference signals for channel estimation and coherent detection.

110

참고 답변

The 10 refers to the data transfer rate, which in this case is 10 Mbps. The term 'Base' refers to baseband, as opposed to broadband.

111

참고 답변

Paging based on location info uses tracking areas to limit paging to relevant cells.

112

참고 답변

Top candidates will know that high availability requires implementing redundancy and failover mechanisms. For this, they'd need to: Use multiple, redundant links and devices to eliminate single points of failure; Implement technologies like load balancing and clustering to distribute traffic evenly and handle failures; Make regular backups and have disaster recovery plans to restore services quickly.

113

참고 답변

A QoS flow is the finest granularity of QoS differentiation in 5G, identified by a QoS Flow ID (QFI).

114

참고 답변

Multiple RACH formats support different cell sizes and environments.

115

참고 답변

Establishment causes in 5G RRC: 'emergency' (emergency calls), 'highPriorityAccess' (high priority), 'mt-Access' (mobile terminated), 'mo-Signalling' (mobile originated signaling), 'mo-Data' (mobile originated data), 'mo-VoiceCall' (voice call), and 'delayTolerantAccess' (IoT).

116

참고 답변

RNTI (Radio Network Temporary Identifier) is a temporary identifier used to differentiate UEs and specific functions, such as C-RNTI for scheduling and RA-RNTI for random access.

117

참고 답변

SIB2 provides PRACH configuration, preamble parameters, and power control settings.

118

참고 답변

It reduces delay and avoids collision, ensuring faster handover.

119

참고 답변

5G supports bandwidths up to 100 MHz in FR1 and up to 400 MHz in FR2. MCS (Modulation and Coding Scheme) ranges from 0 to 28 for data channels. MAS likely refers to MIMO layers (up to 16 layers). FR1 bands include n1, n2, n3, n5, n7, n8, n12, n20, n25, n28, n41, n66, n71, n77, n78, n79, etc. FR2 bands include n257, n258, n260, n261 as per 3GPP Rel 15/16.

120

참고 답변

Troubleshooting network issues is a key skill necessary for maintaining a robust 5G network. This question will help evaluate this aspect.

121

참고 답변

PHR is reported per activated component carrier using extended PHR.

122

참고 답변

Network densification refers to the deployment of a higher number of base stations, such as small cells and distributed antenna systems, to increase network capacity and improve coverage in 5G.

123

참고 답변

MIMO uses multiple antennas to improve data rates, reliability, and spectral efficiency through spatial multiplexing and diversity.

124

참고 답변

The MIB provides critical parameters for the UE to decode further system information.

125

참고 답변

Downlink carrier aggregation increases bandwidth and data rates.

126

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Advanced interference management techniques, such as interference cancellation, dynamic scheduling, and advanced receiver algorithms, are employed in the air interface to mitigate interference and improve spectral efficiency.

127

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KRRCint provides integrity protection for RRC messages.

128

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The fifth generation of wireless technology, or 5G network, offers 4G LTE networks a competitive speed advantage, lower latency, and increased capacity. It may greatly affect how we live, work, and have fun. With 5G wireless technology, more users will have access to higher peak data speeds of several gigabits per second (Gbps), extremely low latency, improved reliability, huge network capacity, and a more consistent user experience. Speed: Compared to the median speeds of 4G LTE, 5G can deliver high speeds up to 10 times quicker.

129

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The network may queue or prioritize paging requests to manage overload.

130

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Encryption is the process of encoding information into a code that is unintelligible to unauthorized users. This data is then decoded or decrypted back to its normal, readable format using a secret key or password. Encryption ensures that data intercepted in transit remains unreadable, as the user must have the correct password or key to decrypt it.

131

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Common cell bandwidth options in 5G networks include 5 MHz, 10 MHz, 20 MHz, 40 MHz, 80 MHz, and 100 MHz. The choice of cell bandwidth depends on factors such as available spectrum, network requirements, and deployment scenarios.

132

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Paging allows UEs to sleep most of the time, waking only for paging occasions, saving power.

133

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Inter-frequency handover moves the UE to a different frequency for load balancing or coverage.

134

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Rate matching adjusts the code rate to fit the available resources for HARQ transmissions.

135

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DRX on-duration keeps the UE awake to monitor PDCCH for scheduling.

136

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In 5G, the S-GW is replaced by the UPF (User Plane Function), which handles packet routing and forwarding.

137

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RAR includes timing advance, uplink grant, and TC-RNTI.

138

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ACK confirms successful reception, while NACK triggers retransmission.

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