BHN2025 Day 2

What was the primary limitation of pre-cellular mobile radio systems?

• High power consumption

• No frequency reuse, leading to limited capacity

• Poor signal quality due to interference

• Expensive mobile devices

What is the main purpose of the cellular concept in mobile communication?

• To increase the coverage area

• To reduce mobile device size

• To solve spectral congestion and increase capacity

• To improve call quality only

What is the typical shape used for cellular network planning?

• Circle

• Square

• Triangle

• Hexagon

What is the main purpose of frequency reuse in cellular systems?

• To allow more users to access the network

• To improve the voice quality of calls

• To prevent signal attenuation

• To eliminate the need for handoffs

What is the function of a Mobile Switching Center (MSC)?

• Assigning IP addresses to mobile devices

• Managing call routing and handoffs

• Encoding and encrypting data

• Enhancing signal quality in urban areas

What is the purpose of a handoff in cellular communication?

• To transfer a call from one frequency to another

• To switch a call between two network operators

• To allow a call in progress to continue when moving between cells

• To disconnect inactive users from the network

What type of interference occurs between signals using the same frequency in different cells?

• Adjacent channel interference

• Co-channel interference

• Multipath interference

• Doppler interference

Which capacity improvement technique involves dividing congested cells into smaller ones?

• Frequency reuse

• Cell splitting

• Dynamic channel allocation

• Trunking

What is the purpose of the umbrella cell concept?

• To reduce power consumption in mobile devices

• To accommodate users with different mobility speeds

• To eliminate the need for base stations

• To provide backup power for cellular towers

What is Doppler shift in mobile communication?

• A change in signal strength due to obstacles

• A shift in received signal frequency due to motion

• A reduction in battery life due to signal processing

• A type of interference caused by overlapping frequencies