Tata Communications Transformation Services FM RAN Engineer Interview Questions and Answers

Q1. Parameter & Lte question
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Q2. RF KPI & Drop Call
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Profit loss, mental ability, computer network

Q1. LTE Frame Structure
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Q2. Type 1 and Type 2
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Q1. Different n/w layers
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Different network layers include physical, data link, network, transport, session, presentation, and application layers.
• Physical layer: responsible for transmitting raw bits over a communication channel

• Data link layer: responsible for error-free transfer of data between nodes on a network

• Network layer: responsible for routing data packets between networks

• Transport layer: responsible for reliable data transfer between a...read more
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Q1. Firewall works on what layers
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Firewall works on multiple layers of OSI model
• Firewall operates on layers 3 (network layer) and 4 (transport layer) of the OSI model

• It can filter traffic based on IP addresses, ports, protocols, and other criteria

• Firewalls can also perform deep packet inspection to detect and block malicious traffic

• Examples of firewall software include Cisco ASA, pfSense, and Windows Firewall
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Q1. What is HO? and its type? Events in HO
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HO stands for Handover. It is a process of transferring an ongoing call or data session from one cell to another.
• There are two types of HO: Intra-cell HO and Inter-cell HO

• Intra-cell HO occurs when a mobile device moves from one channel to another within the same cell

• Inter-cell HO occurs when a mobile device moves from one cell to another

• Events in HO include HO Request, HO Access, HO Required, HO Command, and HO Complet
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Q2. Whats is MCR ?How we can improve MCR? What is the reason of MCR?
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MCR stands for Maximum Cell Rate. It is the maximum rate at which cells can be transmitted through a network.
• MCR is an important parameter in ATM (Asynchronous Transfer Mode) networks.

• It is used to ensure that the network does not become congested.

• MCR is determined by the network operator and is based on the capacity of the network.

• Improving MCR can be done by increasing the capacity of the network or by optimizing the...read more
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Q3. Whats is CQI and MCS?
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CQI stands for Channel Quality Indicator and MCS stands for Modulation and Coding Scheme.
• CQI is a feedback mechanism used in wireless communication systems to indicate the quality of the channel.

• MCS is a technique used to modulate and encode data for transmission over a wireless channel.

• CQI and MCS are used together to optimize the transmission rate and quality of wireless communication.

• Higher CQI values indicate bette...read more
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Q4. Whats is Volte call flow?
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Volte call flow is the process of establishing and maintaining a voice call over a 4G LTE network.
• The call is initiated by the user and sent to the LTE network

• The network sends a SIP invite message to the called party

• The called party responds with a SIP 180 ringing message

• Once the call is answered, the network sends a SIP 200 OK message

• The voice call is established and maintained over the LTE network
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Q5. Whats is difference between cell throughput and user throughput?
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Cell throughput refers to the amount of data transmitted by a cell, while user throughput is the amount of data received by a user.
• Cell throughput is the total amount of data transmitted by a cell, including data sent to all users within the cell.

• User throughput is the amount of data received by a single user within the cell.

• Cell throughput is affected by factors such as the number of users, signal strength, and availa...read more
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Q1. Whats is CA?and its types?ands its combinations?
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CA stands for Carrier Aggregation. It is a technology used in LTE networks to combine multiple frequency bands for higher data rates.
• CA allows for faster data speeds by combining multiple frequency bands.

• There are two types of CA: intra-band and inter-band.

• Intra-band CA combines multiple carriers within the same frequency band.

• Inter-band CA combines carriers from different frequency bands.

• CA can be used in different co...read more
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Q2. Whats is interference?and its types with examples?
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Interference is the unwanted signal that affects the quality of the desired signal.
• Interference can be caused by external sources such as other wireless devices, power lines, or natural phenomena like lightning.

• It can also be caused by internal sources such as reflections, multipath, or co-channel interference.

• Types of interference include thermal noise, crosstalk, adjacent channel interference, and intermodulation int...read more
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Q3. Reasons of low throughput and how will improve low throughout?
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Q4. What is SIB?and different types of SIB?
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SIB stands for System Information Block. It is a type of message used in wireless communication systems.
• SIBs contain information about the network, such as cell identity, location area code, and frequency.

• There are different types of SIBs, including SIB1, SIB2, SIB3, SIB4, SIB5, SIB6, SIB7, SIB8, SIB9, SIB10, SIB11, and SIB12.

• SIB1 is the most important SIB, as it contains information about the cell identity, frequency,...read more
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Q1. Rssi , kpi, Nsb, dus to bbu migration
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Q2. Lte architecture ,lte frame
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Q3. Tdd ,fdd , half duplex and full duplex
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Q4. Call flow , scripts work
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Q1. Antenna basics and its parameters.
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Q2. How to design an array antenna.
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Array antennas are designed by arranging multiple antenna elements in a specific configuration to achieve desired radiation pattern and performance.
• Determine the desired radiation pattern and performance requirements

• Select the type of array configuration (linear, planar, conformal, etc.)

• Calculate the spacing between antenna elements based on wavelength and array factor

• Design feeding network to properly feed each antenn...read more
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Q1. What is your previous work?
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Q2. Base on the previous works, basics questions have been asked/
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