Question

What is the key difference regarding channel access between first- and second-generation cellular systems?

Answer 1

ANSWER:

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The key differences between first-and-second generations cellular systems mainly depend on five factors. Those are
I. Digital traffic channels

2. Encryption

3. Error detection and correction

4. channel access

1. Digital traffic channels:

First-generation systems are almost purely analog. Second-generation systems are digital and Provide higher quality signals, higher data rates, support digital services. with overall greater capacity.

2. Encryption:

All second generation systems provide encryption to prevent eavesdropping whereas first generation systems send user traffic in the clear, providing no security.
3. Error detection and correction:
In second-generation system, digital traffic allows for detection and correction, giving clear voice reception.

4. Channel access:
In first generation systems, each cell supports a number of channels. At any given time a channel is allocated to only one user. Whereas second generation systems allow channels to be dynamically shared by a number of users.

Second generation systems also provide multiple channels per cell, but each channel is dynamically shared by a number of users using time division multiple access.