Important RGPV Question
EC-503 (B), Mobile Communication
V Sem, EC
UNIT 1
Q.1 Explain the different generations of wireless network. RGPV Dec 2020)
Q.2 Explain Handoff techniques in detail. (RGPV Dec 2020)
Q.3 What is the need of handoff ? (RGPV Dec 2020)
Q.4 Write short notes on. (RGPV Dec 2020)
i) Co-channel interference.
ii) Capacity of cellular system
iii) Grads of Service
iv) Hard handoff and soft handoff
Q.5 What is the Cellular concept? Why hexagonal cells are used in cellular system? Describe the cellular system with the help of neat diagram. (RGPV Nov 2022)
Q.6 Define frequency reuse. Explain the frequency reuse concept. What is the need of frequency reuse? What is frequency reuse factor? (RGPV Nov 2022)
Q.7 Explain frequency reuse concept with the help of proper cellular diagram. Also draw a cellular system with 19-cell reuse and locate the co-channel cells for this system. (RGPV Nov 2023)
Q.8 Illustrate the MAHO technique and Queuing concept in hand off. Also explain the different types of handoff in mobile communication. (RGPV Nov 2023)
Q.9 With the help of block diagram describe the basic cellular system and discuss its performance criteria. (RGPV Nov 2023)
UNIT 2
Q.1 Explain free space propagation model. (RGPV Dec 2020)
Q.2 Define the terms
i) Doppler spread
ii) Coherence time (RGPV Dec 2020)
Q.3 Explain Clarke’s model of flat fading. RGPV Dec 2020)
Q.4 Describe handoff mechanism in cellular mobile system. What is its necessity? What are different handoff types? (RGPV Nov 2022)
Q.5 What are the various mechanisms for capacity increase in cellular system? Explain. (RGPV Nov 2022)
Q.6 What do you understand by coherence bandwidth, Doppler spread and coherence time? Explain in detail. (RGPV Nov 2022)
Q.7 Explain Clarke’s model for flat fading in detail. Also discuss level crossing and fading statistics. (RGPV Nov 2022)
Q.8 Under what conditions slow fading, fast fading, flat fading and frequency selective fading results? Explain. (RGPV Nov 2022)
Q.9 Explain foliage losses and propagation in near-in-distance. (RGPV Nov 2023)
Q.10 If the coherence bandwidth is calculated as 100 kHz in the given radio channel of 900 MHz frequency, calculate the maximum symbol rate that can be transmitted over this channel that will suffer minimal inter symbol interference. (RGPV Nov 2023)
Q.11 Explain Clarke’s model of flat fading. (RGPV Nov 2023)
UNIT 3
Q.1 Explain capacity of cellular system. (RGPV Dec 2020)
Q.2 Define the terms
i) Cell splitting
ii) Sectoring (RGPV Dec 2020)
Q.3 Describe the ground reflection propagation model for mobile radio propagation. (RGPV Nov 2022)
Q.4 Describe aritennas used at cell site. Discuss unique situations of cell site antenna. (RGPV Nov 2022)
Q.5 What are the reasons/sources of co-channel interference? How it can be reduced? (RGPV Nov 2022)
Q.6 Explain method to reduce co-channel interference. (RGPV Dec 2020)
Q.7 What is non-fixed channel assignment? Explain different types of non-fixed channel assignment algorithms. (RGPV Nov 2022)
Q.8 Explain Cell splitting and Concept of frequency channels. (RGPV Nov 2023)
Q.9 Elaborate dynamic channel assignment and compare its advantages and disadvantages with the fixed channel assignment. (RGPV Nov 2023)
Q.10 What is co-channel interference? What is the main reason for it? How can be co-channel interference be reduced? (RGPV Nov 2023)
Q.11 In a mobile radio environment, for hilly terrain of height H-100 m, the average cell site antenna height is about 50m, the mobile antenna height is about 3m and the communication path length is 5 km. Find the incident angle and the slope angle. (RGPV Nov 2023)
UNIT 4
Q.1 What are the different multiplexing techniques. (RGPV Dec 2020)
Q.2 Explain the architecture of GSM.(RGPV Dec 2020)
Q.3 What do you mean by GSM? (RGPV Dec 2020)
Q.4 Draw the GSM architecture and explain each sub-system. RGPV Nov 2022)
Q.5 What multiple access scheme are used for GSM? Explain. RGPV Nov 2022)
Q.6 For GSM explain traffic channel control channel and frame structure. (RGPV Nov 2022)
Q.7 Explain GSM with the help of proper network architecture block diagram. Also give brief view of various Interface standards in GSM. (RGPV Nov 2023)
Q.8 Explain frame structure. (RGPV Nov 2023)
UNIT 5
Q.1 Explain spread spectrum multiple access in detail. RGPV Dec 2020)
Q.2 Explain CDMA with suitable diagram. (RGPV Dec 2020)
Q.3 Compare and explain slow frequency hopping and fast frequency hopping. Also describe the working of Frequency Hopped Spread Spectrum (FHSS). RGPV Nov 2022)
Q.4 Explain call processing and handoff procedures in CDMA systems. (RGPV Nov 2022)
Q.5 Describe forward and reverse CDMA channels. (RGPV Nov 2023)
Q.6 In IS-95 CDMA, assume K 20 users share the same 1.25 MHz channel. The chip rate for each user is 1.2288 Mcps and each user has a baseband data rate of 13 kbps. If a maximum E/N of 7.8 dB is provided for each user and the PN code lengths are 32,678 chips (25), find the bit error probability for a user. What is the processing gain of IS-95? (RGPV Nov 2023)
Q.7 Write a short note on any two: (RGPV Nov 2023)
i) Trunking and grade of service
ii) Free space propagation model
iii) GSM traffic channel
iv) Mobile to Mobile propagation
— Best of Luck for Exam —
