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I applied via Company Website and was interviewed in Jul 2019. There were 4 interview rounds.
LTE attach procedure is the process of a device connecting to the LTE network and obtaining an IP address.
The device sends an attach request to the LTE network.
The network validates the request and assigns a temporary identifier to the device.
The network sends an attach accept message to the device, which includes the assigned identifier and an IP address.
The device acknowledges the attach accept message and completes ...
CFRA and CBRA are different algorithms used in RACH. Success rates can be fetched separately.
CFRA stands for Contention Free RACH Algorithm, while CBRA stands for Contention Based RACH Algorithm.
CFRA is used for devices with higher priority, while CBRA is used for devices with lower priority.
Success rates for CFRA and CBRA can be fetched separately by analyzing the RACH logs.
CFRA success rate is usually higher than CBR
We ensure accessibility improvement in LTE network through various measures.
Conducting regular network audits to identify areas of improvement
Deploying small cells and repeaters to improve coverage in remote areas
Implementing carrier aggregation to increase network capacity
Providing network optimization services to improve network performance
Collaborating with device manufacturers to ensure compatibility with our netwo...
I analyze network data to identify areas with high PS drops and work on optimizing those areas.
Analyze network data to identify areas with high PS drops
Optimize network parameters such as RSRP, RSRQ, SINR, etc.
Check for interference and adjust antenna tilt and azimuth
Ensure proper handover parameters are set
Perform drive tests to validate improvements
Collaborate with other teams such as RF and Core to resolve issues
Imp...
I ensure proper parameter tuning, interference management, and capacity planning for LTE network throughput improvement.
Regularly monitor network KPIs to identify areas of improvement
Optimize network parameters such as handover parameters, antenna tilt, etc.
Implement interference management techniques such as interference coordination, power control, etc.
Perform capacity planning to ensure sufficient resources are avai...
HARQ & TTI Bundling are techniques used in wireless communication to improve data transmission efficiency.
HARQ stands for Hybrid Automatic Repeat Request and is used to improve the reliability of data transmission by retransmitting erroneous packets.
TTI Bundling stands for Transmission Time Interval Bundling and is used to reduce latency by transmitting multiple packets in a single transmission time interval.
The value ...
VoLTE e2e call flow is the process of establishing a voice call over LTE network.
The call is initiated by the user and the device sends a SIP invite message to the IMS network.
The IMS network authenticates the user and sends a SIP 180 ringing message to the device.
Once the called party answers, the IMS network sends a SIP 200 OK message to the device.
The device then sets up the media path and sends a SIP ACK message to...
SIP call flow in VoLTE involves signaling between UE, IMS, and PSTN networks.
UE sends INVITE message to IMS network
IMS network authenticates and authorizes the user
IMS network sends INVITE message to PSTN network
PSTN network sends ringing message to IMS network
IMS network sends ringing message to UE
When call is answered, media flow is established between UE and PSTN network
Call teardown involves exchange of BYE message
The mobile network operator has major involvement in SRVCC.
SRVCC stands for Single Radio Voice Call Continuity
It is a feature that allows a seamless handover of voice calls from LTE to 3G or 2G networks
The mobile network operator is responsible for implementing and supporting SRVCC
VoLTE uses various speech codecs for efficient voice transmission.
AMR-WB (Adaptive Multi-Rate Wideband) codec is widely used in VoLTE.
Other codecs used include EVS (Enhanced Voice Services), Opus, and G.711.
The choice of codec depends on factors such as network capacity, device compatibility, and call quality requirements.
I have worked on LTE & VoLTE features such as QoS, SRVCC, CSFB, TTI bundling, etc. and their related parameters.
QoS parameters such as ARP, QCI, GBR, MBR, etc.
SRVCC parameters such as HO margin, HO failure threshold, etc.
CSFB parameters such as timer values, RAT priority, etc.
TTI bundling parameters such as bundle size, bundle factor, etc.
VoLTE parameters such as AMR codec modes, RTP packetization, etc.
UE categories an...
There are 3 MCS (Modulation and Coding Schemes) in LTE.
MCS 1: QPSK modulation with coding rate of 1/2
MCS 2: 16QAM modulation with coding rate of 1/2
MCS 3: 64QAM modulation with coding rate of 2/3
Higher MCS values indicate higher modulation and coding rates
The selection of MCS depends on the channel quality and available bandwidth
FDD and TDD are two different duplexing techniques used in wireless communication networks.
FDD stands for Frequency Division Duplexing while TDD stands for Time Division Duplexing.
In FDD, separate frequency bands are used for uplink and downlink communication while in TDD, the same frequency band is used for both uplink and downlink communication.
FDD is commonly used in 3G and 4G networks while TDD is commonly used in ...
The maximum throughput in LTE network with 20MHz TDD bandwidth depends on various factors.
Theoretical maximum throughput is 1.6 Gbps
Practical maximum throughput is around 1 Gbps
Actual throughput depends on factors like signal strength, interference, number of users, etc.
Carrier aggregation and MIMO can increase throughput
Real-world throughput can be measured using tools like speedtest.net
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posted on 16 Apr 2024
I applied via Referral and was interviewed in Mar 2024. There was 1 interview round.
MPLS (Multiprotocol Label Switching) is a protocol used in high-performance telecommunications networks to direct data packets along predefined paths.
MPLS is used to improve network performance by efficiently routing data packets based on labels instead of IP addresses.
It is commonly used in scenarios where quality of service (QoS) and traffic engineering are important, such as in large enterprise networks or service p...
Three different INTER_AS solutions and their advantages and disadvantages
Option 1: Option A - Advantages: Scalability, Disadvantages: Complexity
Option 2: Option B - Advantages: Simplicity, Disadvantages: Limited scalability
Option 3: Option C - Advantages: Flexibility, Disadvantages: Potential security risks
Good .best . wonderful
I applied via Campus Placement and was interviewed in Sep 2023. There were 3 interview rounds.
It contains logical reasoning, quantitative aptitude, and technical questions
I was interviewed in May 2023.
I applied via Company Website and was interviewed in Oct 2022. There were 3 interview rounds.
The discussion is about the benefits and drawbacks of artificial intelligence and UPI payments.
I applied via LinkedIn and was interviewed in Jul 2022. There were 3 interview rounds.
Load balancing involves distributing network traffic across multiple servers to optimize resource utilization and prevent overload.
Parameters for load balancing include server health, server capacity, and current network traffic.
To improve various KPIs like VDR, HOSR, Initial ERAB, CQI, and SSSR, you can adjust load balancing algorithms, optimize server performance, and monitor network traffic.
For example, you can use ...
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