---
title: "Advantages of TDMA over FDMA"
subject: "Wireless Communication"
chapter: 7
key: "semester_7/wireless_communication:tdma-advantages-over-fdma"
source: https://www.bctengineer.com/q/semester_7/wireless_communication/tdma-advantages-over-fdma
site: BCT Engineering
---

# Advantages of TDMA over FDMA

Wireless Communication · Chapter 7: Multiple Access in Wireless Communication

- Asked in: 2071 Magh, 4 marks
- Video: [2.2 - MULTIPLE ACCESS - FDMA/TDMA/CDMA/OFDMA](https://www.youtube.com/watch?v=oYRMYSIVj1o) — LTE
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_7/wireless_communication/tdma-advantages-over-fdma
- Whole chapter: https://www.bctengineer.com/md/semester_7/wireless_communication/chapter-7

## Question

What are the advantages of TDMA cellular system over FDMA cellular system?

## Short answer

TDMA allows multiple users per carrier, reducing base station transceivers, and eliminates duplexers by separating transmit/receive in time. Mobile-assisted handoff becomes possible during idle slots, battery life improves via burst transmission, and flexible bit rates are supported by allocating multiple slots. Digital TDMA also provides encryption, error control, and higher spectral efficiency than analog FDMA with fewer guard bands.

## Answer

A TDMA cellular system shares one carrier among several users in time slots, while FDMA gives each user its own carrier. TDMA has these advantages over FDMA:

1. **Fewer transceivers** – one radio at the base station serves several users (8 in GSM), reducing cost and size.
2. **No duplexer needed** – transmit and receive happen in different time slots, so the handset is simpler.
3. **Battery saving** – the mobile transmits only in its slot (discontinuous transmission) and can switch off its transmitter between bursts.
4. **Mobile-assisted handoff (MAHO)** – during idle slots the mobile measures signal strength of neighbouring base stations, giving faster and more reliable handoff.
5. **Flexible bit rate** – a user can be given several slots for higher data rates (e.g. GPRS, HSCSD).
6. **Higher capacity / spectral efficiency** – digital coding, speech compression and better reuse give more users per MHz than analog FDMA.
7. **Fewer guard bands and simpler filtering** – wide carriers mean fewer channel edges; less adjacent-channel interference from intermodulation.
8. **Digital features** – easy encryption, error control coding and data services.

| Point | FDMA | TDMA |
|---|---|---|
| Users per carrier | 1 | Several |
| Duplexer | Needed | Not needed |
| Handoff | Network controlled | Mobile assisted |
| Battery use | Continuous Tx | Burst Tx |

## Check yourself

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

1. Why does TDMA need fewer base station transceivers than FDMA?
   A. It has no radios
   B. One radio serves several users (8 in GSM) through time slots
   C. It uses wider antennas
   D. Each user has its own carrier
   Answer: B. One carrier is shared among several users in time slots. (Key point: Fewer transceivers)

2. Why is a duplexer not needed in a TDMA handset?
   A. It transmits and receives on the same frequency continuously
   B. It uses codes
   C. Transmit and receive occur in different time slots
   D. It uses a wider band
   Answer: C. Time separation of transmit and receive removes the need for a duplexer. (Key point: No duplexer)

3. What is mobile-assisted handoff in TDMA?
   A. Mobile measures neighbouring base station signals during idle slots, giving faster, more reliable handoff
   B. Network alone decides without measurement
   C. The mobile selects a new code
   D. The mobile transmits continuously
   Answer: A. Idle slots let the mobile measure neighbours and report. (Key point: MAHO)

4. Why does TDMA save handset battery?
   A. Power control is not used
   B. It uses lower frequency
   C. The mobile has a bigger battery
   D. The mobile transmits only in its own slot and can switch off between bursts
   Answer: D. Discontinuous burst transmission lets the transmitter turn off. (Key point: Battery saving)

## Related in Wireless Communication

- [TDMA versus FDMA](https://www.bctengineer.com/question.md?key=semester_7%2Fwireless_communication%3Atdma-vs-fdma) — Wireless Communication, chapter 7
- [FDMA vs TDMA; operation of FHMA](https://www.bctengineer.com/question.md?key=semester_7%2Fwireless_communication%3Afdma-tdma-fhma) — Wireless Communication, chapter 7
- [Advantages and disadvantages of FDMA, TDMA, CDMA](https://www.bctengineer.com/question.md?key=semester_7%2Fwireless_communication%3Afdma-tdma-cdma-pros-cons) — Wireless Communication, chapter 7
- [Numerical: cellular vs non-cellular voice channels](https://www.bctengineer.com/question.md?key=semester_7%2Fwireless_communication%3Acellular-vs-noncellular-channels) — Wireless Communication, chapter 2
- [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
- [CDMA vs TDMA; FHSS multiple access](https://www.bctengineer.com/question.md?key=semester_7%2Fwireless_communication%3Acdma-advantages-fhss-types) — Wireless Communication, chapter 7

## Related in other subjects

- [FDMA vs TDMA; T1 and E1 hierarchy](https://www.bctengineer.com/question.md?key=semester_6%2Fcommunication_systems%3Afdma-tdma-t1-e1) — Communication Systems, chapter 5
- [OFC system; pros and cons over metal wire](https://www.bctengineer.com/question.md?key=semester_6%2Fpropagation_and_antenna%3Aofc-system-vs-metal-wire) — Propagation and Antenna, chapter 6