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4G LTE Interview Questions Bank
WELCOME
Welcome to the Course (2:19)
MODULE 1: LTE FUNDAMENTALS
Module 1: PRE-LEARNING
Module 1 Overview Video (14:32)
WHAT IS LTE ?
WHAT IS SAE?
WHAT ARE THE NAMING CONVENTIONS IN SAE/LTE?
HOW DO SUBSCRIBERS BENEFIT FROM SERVICES PROVIDED BY LTE? OR WHY DO WE NEED LTE ? AREN'T 2G, 3G ALREADY ENOUGH FOR SUBSCRIBER SERVICES?
CAN GSM AND WCDMA/HSPA WORK SEAMLESSLY WITH LTE?
WILL LTE REPLACE FIXED BROADBAND?
WHICH SPECTRUM LTE USES?
WHAT KIND OF BIT-RATES LTE CAN DELIVER?
WHAT LATENCY IS EXPECTED IN LTE SYSTEM?
DOES LTE PROVIDE VOICE SERVICE?
DOES LTE HAVE A NEW CORE NETWORK COMPARED TO 3G ?
WHAT IS THE DIFFERENCE BETWEEN FDD AND TDD MODE IN LTE?
HOW DOES LTE SUPPORT OPERATORS TO REDUCE OPEX?
WHAT WAS THE OBJECTIVE OF 3GPP IN TERMS OF LTE REQUIREMENTS?
EXPLAIN DL AND UL TRANSMISSION SCHEME IN LTE ? WHAT IS THE CONCEPT OF CYCLIC PREFIX IN LTE ? WHAT IS THE ADVANTAGE OF CYCLIC PREFIX ? (31:32)
WHAT UL TRANSMISSION SCHEME IS USED?
WHAT DL TRANSMISSION SCHEME IS USED?
WHAT ARE THE THEORETICAL PEAK DATA RATES ASSUMPTIONS?
WHAT IS THE CONTROL PLANE (CP) LATENCY IN LTE ?
WHAT IS THE USER PLANE (UP) LATENCY IN LTE ?
WHAT USER THROUGHPUT CAN BE ACHIEVED? OR WHAT USER THROUGHPUT VALUES ARE ACHIEVED IN LTE COMPARED TO HSPA?
WHAT SPECTRUM EFFICIENCY CAN BE ACHIEVED IN LTE ?
OVERALL EPS OVERVIEW: WHAT IS EPS?
WHAT IS THE BEARER CONCEPT SUPPORTED BY THE EPS?
WHAT IS THE COMPOSITION OF EPC?
WHAT IS THE COMPOSITION OF E-UTRAN?
CAN LTE SYSTEM BE DEPLOYED IN A NETWORK ALREADY SUPPORTING 2G or 3G ?
WHAT INTERFACES DOES SAE/LTE HAVE?
WHAT IS THE FUNCTIONALITY OF THE MME NODE?
WHAT IS THE FUNCTIONALITY OF THE P/S-GW NODE?
WHY DO WE NEED POOLING OF MME AND S-GW?
WHAT IS THE ENODE B FUNCTIONALITY?
WHAT PROTOCOLS ARE INVOLVED IN THE CONTROL PLANE OF LTE ? CAN YOU EXPLAIN THEIR FUNCTIONALITY BRIEFLY ?
WHAT ARE THE EPS MOBILITY MANAGEMENT STATES?
WHAT ARE THE POSSIBLE RRC STATES?
What is the difference between 3GPP and non-3GPP technologies ? (3:19)
Module 1: POST-LEARNING
MODULE 2: AIR INTERFACE & RELATED PROCEDURES
Module 2: PRE-LEARNING
Module 2 Overview Video (12:20)
Random Access Procedure Power Control Video (8:43)
WHAT IS RANDOM ACCESS PREAMBLE ? HOW IT IS STRUCTURED ? (VIDEO) (9:27)
WHAT IS RANDOM ACCESS PROCEDURE (PHASE 1) OR WHAT IS PHASE 1 OF RANDOM ACCESS PROCEDURE ?
WHAT IS THE RANDOM-ACCESS RESPONSE (PHASE 2)? OR WHAT IS PHASE 2 OF THE RANDOM ACCESS PROCEDURE ?
WHAT IS RANDOM ACCESS PHASE 3 ? OR HOW IS THE FIRST SCHEDULED UL TRANSMISSION (PHASE 3) DONE ?
WHAT IS THE CONTENTION RESOLUTION (RANDOM ACCESS PHASE 4)?
WHAT IS THE PURPOSE OF CONTENTION-FREE RANDOM ACCESS PROCEDURE?
WHAT IS THE MEANING OF THE RANDOM-ACCESS BACK-OFF PROCEDURE?
WHAT ARE THE USER PLANE PROTOCOL STACK AND FUNCTIONALITY OF THOSE PROTOCOL LAYERS?
WHY DO WE NEED UPLINK TIME-ALIGNMENT IN RRC CONNECTED MODE?
WHAT IS THE PURPOSE OF THE MAC LAYER IN LTE?
HOW DOES HARQ OPERATE?
WHAT IS THE PURPOSE OF THE RLC LAYER?
WHAT IS THE PURPOSE OF THE PDCP LAYER?
WHERE ARE DATA FLOW AND MULTIPLEXING USED IN LTE AIR INTERFACE? OR HOW DO PROTOCOLS OPERATE IN LTE AIR INTERFACE?
WHAT IS THE PURPOSE OF THE PHY LAYER?
WHAT ARE THE AVAILABLE TRANSPORT CHANNELS IN LTE?
WHAT AVAILABLE LOGICAL CHANNELS EXIST IN LTE ?
WHAT IS THE MAPPING BETWEEN LOGICAL CHANNEL , TRANSPORT CHANNELS AND PHYSICAL CHANNELS ?
WHAT ARE THE PHYSICAL CHANNELS AND SIGNALS USED IN LTE?
WHAT IS THE STRUCTURE OF THE DOWNLINK PHYSICAL RESOURCE IN LTE ?
WHAT IS THE DIFFERENCE BETWEEN NORMAL AND EXTENDED CYCLIC PREFIX IN LTE DOWNLINK TRANSMISSION?
WHAT REFERENCE SIGNALS ARE DEFINED FOR LTE DOWNLINK TRANSMISSION?
WHAT IS THE PROCEDURE FOR DOWNLINK L1/L2 CONTROL SIGNALLING IN LTE?
WHY IS BLINDING DECODING USED FOR PDCCH ?
HOW IS DOWNLINK POWER CONTROL USED IN LTE?
HOW IS POWER CONTROL USED IN LTE UPLINK TRANSMISSION?
WHAT IS LINK ADAPTION?
HOW IS LINK ADAPTATION USED IN LTE DOWNLINK ?
HOW IS LINK ADAPTATION USED IN LTE UPLINK?
HOW DOES PAGING WORK IN LTE?
HOW IS SC-FDMA SIGNAL GENERATED IN LTE? HOW IS UPLINK SIGNAL GENERATED?
WHAT REFERENCE SIGNALS ARE DEFINED FOR LTE UPLINK TRANSMISSION?
WHAT UPLINK L1/L2 CONTROL SIGNALLING IS DEFINED FOR LTE?
HOW IS UPLINK TRANSMIT-TIMING CONTROL HANDLED IN LTE?
DOES UPLINK TIME ALIGNMENT REMAIN VALID FOR THE UE ALL THE TIME?
Module 2: POST LEARNING
MODULE 3: TIME DIVISION DUPLEXING (TDD)
Module 3: PRE-LEARNING
Module 3 Video Overview (9:09)
HOW DOES THE TIME-DOMAIN STRUCTURE LOOK FOR LTE FDD?
HOW DOES THE TIME-DOMAIN STRUCTURE LOOK FOR LTE TDD?
HOW CAN GUARD PERIODS BE CREATED FOR LTE TDD MODE OF OPERATION?
TDD ASPECTS : WHY HAS 3GPP STANDARDIZED BOTH FDD AND TDD FOR LTE?
What is FDD, TDD and Half Duplex FDD ?
WHAT ARE THE MAJOR DIFFERENCES BETWEEN LTE TDD AND LTE FDD?
WHAT ARE THE REQUIRED GUARD PERIODS BETWEEN UL AND DL FOR LTE TDD MODE OF OPERATION?
HOW CAN LTE TDD EFFICIENTLY CO-EXIST WITH OTHER LTE OR LEGACY UTRA TDD NETWORKS?
HOW IS CELL SEARCH PERFORMED IN LTE FDD ? LIST THE MAIN STEPS BRIEFLY.
WHAT ARE THE LTE TDD - SPECIFIC LAYER 1 CHARACTERISTICS?
WHAT ARE THE CONSIDERATIONS FOR NETWORK SYNCHRONIZATION AND COORDINATION FOR LTE TDD MODE OF OPERATION?
WHAT IS THE IMPACT TO L1/L2 CONTROL SIGNALLING FOR LTE TDD?
Module 3: POST LEARNING
MODULE 4: MULTI-ANTENNA SCHEMES
Module 4: PRE-LEARNING
Multi-Antenna Schemes Overview Video (22:24)
WHAT IS THE PURPOSE OF HAVING MULTI-ANTENNA PROCESSING IN LTE?
WHAT ARE THE PRINCIPLES BEHIND THE ADVANCED MULTI-ANTENNA TECHNIQUES TARGETED FOR LTE?
WHAT IS THE DIFFERENCE BETWEEN CHANNEL RANK AND TRANSMISSION RANK ?
HOW WOULD YOU DIFFERENTIATE BETWEEN PEAK RATE AND COVERAGE WITH RESPECT TO USER POSITION ? OR WHEN SHOULD WE USE BEAMFORMING OR SPATIAL MULTIPLEXING ?
WHAT IS PRE-CODING ? IS PRECODING PREFERRED IN FDD OR TDD ? WHAT IS CHANNEL DEPENDENT AND CHANNEL INDEPENDENT CODING ?
DOES SNR IMPROVEMENT DEPENDS ON THE NUMBER OF ANTENNAS ?
HOW DOES MIMO CHANNEL PROPERTIES AFFECT THE CHOICE OF TRANSMISSION SCHEME ?
WHAT DISTINGUISHES BEAMFORMING FROM PRECODING? IS BEAMFORMING AND PRECODING ONE AND THE SAME THING?
WHAT ARE THE MULTI-ANTENNA TRANSMISSION SCHEMES FOR THE DOWNLINK TRANSPORT CHANNEL IN LTE?
WHAT ARE THE UPLINK MULTI-ANTENNA SCHEMES IN LTE?
HOW MANY TRANSMISSION MODES AND ASSOCIATED TRANSMISSION SCHEMES ARE DEFINED IN 3GPP ?
Module 4: POST LEARNING
MODULE 5: RADIO FREQUENCY REQUIREMENTS
Module 5: PRE-LEARNING
Module 5 Video Overview (1:43)
WHAT ARE THE MINIMUM AND ALLOWABLE BANDWIDTH OPTIONS IN LTE?
WHAT IS THE RELATIONSHIP BETWEEN CHANNEL BANDWIDTH, TRANSMISSION BANDWIDTH CONFIGURATION AND TRANSMISSION BANDWIDTH WITH RESPECT TO RESOURCE BLOCKS (RBs) ?
WHAT ARE THE SPECTRUM BANDS DEFINED BY 3GPP FOR LTE?
WHAT ADDITIONAL FREQUENCY BANDS ARE BEING CONSIDERED FOR LTE?
WHAT ARE THE POLICY AND PLANNING BODIES FOR REGIONAL RF REQUIREMENTS FOR LTE ?
LIST THE MAJOR eNodeB TRANSMITTER REQUIREMENTS FOR LTE ?
LIST THE MAJOR eNodeB RECEIVER REQUIREMENTS FOR LTE ?
WHAT ARE THE CHANNEL BANDWIDTHS SUPPORTED BY THE UE ?
WHAT DIFFERENT UE POWER CLASSES HAVE BEEN DEFINED ?
WHAT DIFFERENT LTE UE CATEGORIES HAVE BEEN DEFINED ?
Module 5: POST LEARNING
MODULE 6: RADIO RESOURCE MANAGEMENT
Module 6: PRE-LEARNING
Module 6 Video Overview (2:50)
WHAT IS THE PURPOSE WITH RADIO RESOURCE MANAGEMENT IN LTE?
WHAT ARE THE RRM FUNCTIONS THAT ARE SUPPORTED IN LTE ? OR LIST SOME OF THE RRM FUNCTIONS SUPPORTED IN LTE ?
WHAT ARE THE RRM RELATED MEASUREMENTS IN LTE ?
CAN YOU ANSWER ANY QUESTION RELATED TO RRM PROCEDURES OVER THE X2 AND S1 INTERFACES ?
Module 6: POST LEARNING
MODULE 7: MOBILITY
Module 7: PRE-LEARNING
Module 7 Video Overview (10:27)
List basic X2 Application Protocol (X2AP) mobility operation procedures ?
What are the procedures for INTER-RAT radio resource management?
How is INTRA-LTE handovers for UE’s in EMM_CONNECTED mode handled?
What measurements are performed in connection with the INTRA-LTE handover procedure?
How is Packet forwarding handled in LTE during Handover ? How is the User plane packets handled during INTRA-LTE handover execution?
How is security maintained during INTRA-LTE handover execution?
How are INTRA-LTE handover error cases handled?
How are INTRA-LTE handovers for UE’s in EMM_IDLE mode handled? or How tracking area updates take place during mobility ?
How many eNodeBs can be connected to an SGW in a live network ? (6:26)
Can X2 handover take place without CN signaling ? (4:57)
What are the agreed state transitions between 2G/3G and LTE?
What is meant by Mobility IP Point of Presence (PoP) ? What nodes are involved for IP PoP in LTE ? (7:30)
Module 7: POST LEARNING
MODULE 8 : SCHEDULING AND QUALITY OF SERVICE (QoS)
Module 8: PRE-LEARNING
Module 8 Video Overview (0:34)
Scheduling Brief Video (1:12)
QoS in LTE Video Brief (4:07)
How is scheduling defined on a high level for LTE?
How can the basic Downlink scheduling be described?
How is CQI defined and used in LTE scheduling?
How can the basic UPLINK scheduling concept be described?
What are the basic ideas behind scheduling multiple users in the UPLINK?
How is SEMI-PERSISTENT scheduling used to minimize the signaling load?
What is the agreed QoS concept for EPC/E-UTRAN ?
What terminology is used in the area of QoS and bearers?
What is difference between GBR versus non-GBR and Real-Time versusNon-Real Time (NRT) service ?
How can you divide total cell capacity into GBR and non-GBR requirements?
Module 8: POST-LEARNING
MODULE 9: FREQUENTLY ASKED QUESTIONS (FAQs)
Miscellaneous Questions Video Overview (0:47)
Initial Tuning and Drive Testing (7:19)
Accessibility and Retainability Low and High and Vice Versa (2:01)
RachRootSequence and Cell Range effect on Accessibility ? (1:32)
Poor Accessibility due to Bad RF ? (1:24)
QCI 1 or QCI 5 Priority ? (1:37)
How to mitigate external inference using Uplink power ? (1:37)
What is Retainability KPI ? How would you define it ? (2:43)
How would you try to fix Retainability KPI in 4 steps ? (0:55)
Default and Dedicated Bearer (2:02)
What is the relationship between KPIs and System Characteristics ? (1:59)
What is Accessibility KPI ? (2:27)
E-RAB Release or UE Context Release ? (1:32)
What are Integrity KPIs ? (0:48)
How would you approach to improve Throughput KPI ? (3:30)
How would you investigate Latency Issues ? (0:59)
What are different phases which take place during a handover ? (1:06)
How to investigate Handover Preparation Phase Failure ? (1:26)
How to investigate Handover Execution Phase Failure ? (1:14)
Types of RAN Services (1:48)
WHAT ARE THE MULTI-ANTENNA TRANSMISSION SCHEMES FOR THE DOWNLINK TRANSPORT CHANNEL IN LTE?
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