Understanding LTE earfcn in ns3

[sabeeh javed]

Hi,

I need to simulate LTE for 5GHz unlicensed band. I can get the required earfcn number from equation or earfcn calculator like this one
http://niviuk.free.fr/lte_band.php

But when I enter the earfcn value in the code for example

    lteHelper->SetEnbDeviceAttribute ("DlEarfcn", UintegerValue (46590));

The ns3 gives me an error that this DlEarfcn value is invalid.

How can I enter proper Earfcn value so that the carrier frequency is in 5GHz band. Plus, from where can I get the list of Earfcn values that ns 3 support.

Best Regards,

[Konstantinos]

Hi Sabeeh,

Please see the API for the corresponding attribute

DlEarfcn: Downlink E-UTRA Absolute Radio Frequency Channel Number (EARFCN) as per 3GPP 36.101 Section 5.7.3.

• Set with class: ns3::UintegerValue
• Underlying type: uint16_t 0:6599
• Initial value: 100
• Flags: construct write read

Also I would suggest to study the development of LTE-LAA in NS-3

https://www.nsnam.org/wiki/LAA-WiFi-Coexistence

[sabeeh javed]

Thanks for the reply. Some quick questions.

-> Is it possible to simulate LTE in 5GHz band without changing the source files of ns-3.24.

-> For example, I have obtained dl_earfcn of 46590 for 5150MHz band according to
http://niviuk.free.fr/lte_band.php
But I can't use this value in ns3.

[Konstantinos]

Answers inline

On Thursday, February 11, 2016 at 1:29:35 PM UTC, sabeeh javed wrote:

Thanks for the reply. Some quick questions.

-> Is it possible to simulate LTE in 5GHz band without changing the source files of ns-3.24.

No. You need to work on the ns-3 LAA development tree. 

 

-> For example, I have obtained dl_earfcn of 46590 for 5150MHz band according to
http://niviuk.free.fr/lte_band.php
But I can't use this value in ns3.

NS-3 LTE does not support TDD which is for the 5150MHz 

[Dasha Sayed]

Hi Konstantinos. I'm trying to do the same as Sabeeh. With your answer, do you mean that is not possible to adjust LTE for 5GHz band in the LTE Module since the value won't be accepted? Sorry if it is a stupid question but it's not clear to me. Regards.

[Tommaso Pecorella]

Hi,

to operate in the 5GHz band, LTE needs huge changes. these are implemented in the ns-3 LAA development tree.

It is not possible to "simply" shift the LTE band to 5GHz because it doesn't work like that.

T.