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Protocol (VoIP) systems that offer
Computer Science (c) Resource Intensive: Establishing Mobile telephone system and
more flexibility and efficiency in
a dedicated circuit for each call is
resource-intensive compared to
handling voice and data.
packet-switched networks.
FOR ONLINE READING ONLY
Evolution and Integration

(a) ISDN (Integrated Services Digital network protocols
The mobile telephone system is a
Network): An evolution of PSTN wireless communication network that
that allows the transmission of allows users to make voice calls, send
voice and data over the same line, text messages, and access data services
offering higher data rates. on the go. It has evolved significantly
(b) Transition to VoIP: Many PSTN since its inception, moving from analog
systems are being integrated or to digital and now to advanced 5G
replaced with Voice over Internet networks.

Wireless signal from
cell tower to devices Cell phone

Base station

Data centre

House/Residential
area using wireless
communication

Car with Cell phone
mobile signal

Figure 3.61: Mobile telephone system structure

Key Components of mobile telephone system
(a) Mobile Stations (MS): These are the devices used by end-users, such as mobile
phones and tablets.
(b) Base Transceiver Stations (BTS): These are the antennas and equipment that
communicate directly with mobile devices.

206
for Advanced Secondary Schools

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