---
title: "Features introduced from 2G to 5G"
subject: "Wireless Communication"
chapter: 1
key: "semester_7/wireless_communication:features-2g-to-5g"
source: https://www.bctengineer.com/q/semester_7/wireless_communication/features-2g-to-5g
site: BCT Engineering
---

# Features introduced from 2G to 5G

Wireless Communication · Chapter 1: Introduction

- Asked in: 2078 Chaitra, 4 marks
- Video: [1g 2g 3g 4g 5g technology | MC | Mobile Computing | Lec- 05 | Bhanu Priya](https://www.youtube.com/watch?v=kxOUCDjHg_Q) — Education 4u
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_7/wireless_communication/features-2g-to-5g
- Whole chapter: https://www.bctengineer.com/md/semester_7/wireless_communication/chapter-1

## Question

Discuss the features introduced from second to fifth generations of cellular communication system.

## Short answer

2G introduced digital voice, SMS, and security. 3G added mobile data, video calling, and wideband CDMA. 4G provided all-IP high-speed broadband (100 Mbps–1 Gbps) with OFDMA and MIMO, while 5G delivers up to 20 Gbps, 1 ms latency, massive MIMO, mmWave, and network slicing.

## Answer

| Gen | Main features introduced |
|---|---|
| 2G | Digital voice, TDMA/CDMA, encryption, SIM, SMS, low-rate data (9.6–14.4 kbps) |
| 2.5G | GPRS/EDGE packet data (up to ~384 kbps), always-on internet, MMS |
| 3G | WCDMA 5 MHz, 384 kbps–2 Mbps, video calls, mobile internet, soft handoff, global roaming |
| 3.5G | HSPA/HSPA+, adaptive modulation, HARQ, up to tens of Mbps |
| 4G | OFDMA, MIMO, all-IP core, VoLTE, carrier aggregation, 100 Mbps–1 Gbps, ~10 ms latency |
| 5G | NR, mmWave, massive MIMO, beamforming, network slicing, 20 Gbps, ~1 ms latency, massive IoT |

#### 2G
First digital systems (GSM, IS-95, IS-136). Digital speech coding and error control gave clearer voice and higher capacity than analog 1G; authentication and encryption added security; SIM cards and SMS were introduced; international roaming in GSM.

#### 3G
IMT-2000 systems (UMTS/W-CDMA, CDMA2000). Wideband CDMA and packet core brought mobile internet, video telephony and multimedia; HSPA later raised speeds greatly.

#### 4G
IMT-Advanced (LTE-A). Flat all-IP architecture, OFDMA and MIMO for high spectral efficiency; voice as VoIP; scalable bandwidth; HD video and broadband on the move.

#### 5G
IMT-2020 (NR). Three service types: eMBB (very high data rates), URLLC (ultra-reliable, low latency), mMTC (massive IoT). Uses mmWave, massive MIMO, edge computing and network slicing.

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. Which feature first appeared with 2G?
   A. Digital voice with encryption, SIM and SMS
   B. Network slicing
   C. OFDMA
   D. Video telephony
   Answer: A. 2G introduced digital speech, security, SIM and SMS. (Key point: 2G feature)

2. Which feature distinguishes 3G?
   A. Massive MIMO
   B. Wideband CDMA with 5 MHz, video calls and soft handoff
   C. GMSK modulation
   D. VoLTE
   Answer: B. 3G used WCDMA 5 MHz, giving multimedia and soft handoff. (Key point: 3G feature)

3. What did HSPA add?
   A. Adaptive modulation and HARQ giving tens of Mbps
   B. Network slicing
   C. Analog voice
   D. mmWave
   Answer: A. HSPA improved rates using adaptive modulation, HARQ and fast scheduling. (Key point: 3.5G)

4. Which is a 5G service type?
   A. WAP browsing
   B. mMTC for massive IoT
   C. Circuit-switched voice
   D. Analog FDMA
   Answer: B. 5G has eMBB, URLLC and mMTC. (Key point: 5G services)

## Related in Wireless Communication

- [Evolution of generations of cellular systems](https://www.bctengineer.com/question.md?key=semester_7%2Fwireless_communication%3Aevolution-cellular-generations) — Wireless Communication, chapter 1, asked 2×
- [Forward/reverse channel and features of 5G](https://www.bctengineer.com/question.md?key=semester_7%2Fwireless_communication%3Aforward-reverse-5g-features) — Wireless Communication, chapter 1
- [Evolution from 1G to 2.5G (TDMA)](https://www.bctengineer.com/question.md?key=semester_7%2Fwireless_communication%3Aevolution-1g-2g-2-5g-tdma) — Wireless Communication, chapter 1
- [Improvements in 2G, 3G and beyond 3G](https://www.bctengineer.com/question.md?key=semester_7%2Fwireless_communication%3Aimprovements-2g-3g-beyond) — Wireless Communication, chapter 1
- [2G vs 3G, prioritized handoff, cell dragging](https://www.bctengineer.com/question.md?key=semester_7%2Fwireless_communication%3A2g-vs-3g-prioritized-handoff) — Wireless Communication, chapter 1
- [Forward/reverse channel and 5G versus 4G](https://www.bctengineer.com/question.md?key=semester_7%2Fwireless_communication%3Aforward-reverse-5g-vs-4g) — Wireless Communication, chapter 1, asked 2×

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