LTE/Cell


Long Term Evolution is a both a catch all phrase to some and to others a very particular set of technologies. Many marketing people speak of 3G, 4G and 5G networks. The Mobile Network is a heterogeneous (hetnet) integration of technologies.

 

Carrier 4G LTE Bands Frequencies
AT&T 2, 4, 5, 17 1900, 1700 abcde, 700 bc
Verizon Wireless 2, 4, 13 1900, 1700 f, 700 c
T-Mobile 2, 4, 12 1900, 1700 def, 700 a
Sprint 25, 26, 41 1900 g, 850, 2500
Europe 3, 7, 20 1800, 2600, 800
China, India 40, 41 2300, 2500

 

Cellular Frequency Modulation types

 

  • TDMA: In the simplest case we can imagine, each call gets a time-share of the complete frequency band. It's a bit like callers waiting in line for a payphone. Each one waits until the phone is vacated by the previous caller, makes their call, and hands on to the next person.
  • FDMA: With the total frequency band split up into smaller bands, we can imagine sending multiple calls in parallel. This is a bit like having four payphones in a line; four callers can use them simultaneously. We could also run TDMA at the same time, dividing each of the smaller bands into time slots.
  • CDMA: We break each call into pieces, code them, and send them down any available channel. This makes much better use of our available frequency spectrum, because none of the channels is idle at any time. However, channels have to be kept separate to stop them from interfering, which means our total frequency band is used inefficiently.
  • OFDMA: We set up our system so that we can, effectively, superimpose channels on top of one another, packing in even more capacity to give even greater data speeds.



Archives

Use Cases

First Cell Call History

Use Case

Verizon LTE Advanced

Use Case

LTE Public Safety Cow

Use Case

Library

C-RAN and Capacity

Library

IoT and LTE Telit

Library

Roadmap M2M to LTE

Library

LTE Wireless Backhaul Ciena

Library

How Cellular Works

Library

LTE Public Safety Police Cars

Library

LTE Advanced Fundamentals Part 1

Library

LTE Advanced Fundamentals Part 2

Library

LTE Optimization

Library

LTE RRC

Library

Voice over LTE

Library

LTE Public Safety

Library

LTE Best Practices

Library

LTE in Unlicensed

Library

LTE & IoT Telit

Library

What & How

5G building blocks

What & How

5G Virtualization XRAN

What & How

How LTE Works

What & How

MulteFireā„¢ Technology

What & How

MulteFire: A New Way to Wireless

What & How

TelecomTV SCWS Interview - MulteFire Alliance Chairman

What & How

What is LTE and Advanced

What & How

How LTE is improving Public Safety

What & How

How LTE works

What & How

How to plan a Link Budget

What & How