Cousins Facts Zone

What is the role of Medium Access Control (MAC) in mobile communication?
MAC manages how data is transmitted over a shared communication channel, coordinating access to the physical medium. It ensures that multiple devices can transmit data without interference, handling tasks like addressing, error detection, and access control.

What are the advantages of CDMA over FDMA and TDMA?
CDMA allows multiple users to share the same frequency band by assigning unique codes to each user, improving spectral efficiency and reducing interference. It provides better security, supports higher capacity, and is more resistant to noise compared to FDMA (Frequency Division Multiple Access) and TDMA (Time Division Multiple Access).

What are the different types of satellite orbits?
The primary types of satellite orbits are:

• Low Earth Orbit (LEO): Typically 160-2,000 km above Earth's surface.
• Medium Earth Orbit (MEO): Usually 2,000-35,786 km above Earth.
• Geostationary Orbit (GEO): Positioned 35,786 km above Earth's equator, where satellites remain fixed relative to the Earth's surface.
• Polar Orbit: Satellites move over the poles, covering the entire Earth over time.

What is handover in mobile communication?
Handover refers to the process of transferring an active call or data session from one cell or base station to another as the user moves through different coverage areas. This ensures continuous communication without interruption.

What is the role of UTRAN in UMTS?
UTRAN (UMTS Terrestrial Radio Access Network) is responsible for providing wireless communication between mobile devices and the core network in UMTS (Universal Mobile Telecommunications System). It manages radio access, base stations, and controls the radio channels for data transmission.