LTE Handover Procedure

[Jori GH]

Hello,
I'm working on the handover procedure in LTE networks between Macrocells and Femtocells, I want to add more parameters in the decision part (additional to RSRP) as example (the speed of the UE, The available Bandwidth, the type of application RT or Non RT).
But I'm just a beginner and before start working I want to ask if I can do that using NS3 simulator?
Please, can anybody help me ?
Thanks for all

[Konstantinos]

Yes you can. You will just need to update/develop the handover algorithm.

[Jori GH]

Thanks,
Can you help me on how to start?
and also Can you tell me if there are any examples that study the handover between Macrocells and Femtocells?
Thanks for your Help and answer.

[Konstantinos]

http://www.nsnam.org/docs/models/html/lte.html

[Jori GH]

Thanks alot..
But please I need an example that shows the handover between macro and femtocells so I can understand it and update the handover algorithm, so can you help me please , or is the Lena-Dual-Stripe study this case or it just study the handover between macrocells?
sorry for outstanding,, but really I need help...
Thanks for your efforts

بتاريخ الأربعاء، 2 يوليو، 2014 UTC+3 2:50:18 م، كتب Jori GH:

[Konstantinos]

There are TWO examples for handover in ns-3 source code /src/lte/examples

Personally I do not know what type of cells they simulate in those examples but since you know how to create macro/femto from the dual-stripe example, you can similarly modify those (if needed).

[Jori GH]

Thanks for your helping ,,I'll try reading these examples

بتاريخ الأربعاء، 2 يوليو، 2014 UTC+3 2:50:18 م، كتب Jori GH:

[Jori GH]

Sorry, but I found only X2-based Handover examples...I need S1-based handover between the macro and Femto (no x2 interfaces between them)..so please as you know Does NS3 support S1-based Handover?

بتاريخ الأربعاء، 2 يوليو، 2014 UTC+3 2:50:18 م، كتب Jori GH:

[Konstantinos]

http://www.nsnam.org/docs/models/html/lte-design.html#handover

According to this, only X2-based HO is implemented.

[Jori GH]

:So please do you have any suggestion or advises on how to simulate the senario showed in the image? 

UE make a handover from the macrocell (Enb) to Femtocell (Henb) ,, and as you said no s1 handover supported, so how can I do the simulation? Any suggestions?

 

considering the senario without Femto Gateway ,, just S1 interfaces between femtocells and MME/SGW

 

[Konstantinos]

As far as I know, the current LTE module supports only a single MME and a single SGW/PGW. 

http://www.nsnam.org/docs/models/html/lte-design.html#epc-model

[Jori GH]

Thanks a lot for your answering and helping ,

please , consider the scenario is as shown below :

 

Now are there any ways for the UE to handover from eNB to HeNB ?  

Sorry for asking a lot, but I need to know as possible before start working ans simulating.

 

 

[Konstantinos]

Please contact the developers of LTE module for more details.

From a similar request a year ago (https://groups.google.com/d/msg/ns-3-users/I7yVbADfXdw/FXXYpUnCwh0J) the reply was that no S1 HO is planned in short term. So at least for this year I guess that S1-HO is not implemented (from that group).

[Jori GH]

Thanks Sir,
ok (seems no way to do S1 handover). Is it allowed if I decided to suppose that there are X2 interfaces between Macrocells and Femtocells to get rid of  not supporting S1 handover?
for example adding X2 interface between them by :

lteHelper->AddX2Interface (macroEnbs);
lteHelper->AddX2Interface (homeEnbs);

uint32_t nNodes1 = macroEnbs.GetN ();
uint32_t nNodes2 = homeEnbs.GetN ();

for (uint32_t i = 0; i < nNodes1; ++i)
{
for (uint32_t l = 0; l < nNodes2; ++l)
{
Ptr<Node> p = macroEnbs.Get (i);
Ptr<Node> q = homeEnbs.Get (l);
lteHelper->AddX2Interface (p,q);
}
}

[Konstantinos]

This is (a) up to you, your design and assumptions, and (b) up to the reviewers to claim that your design is not valid.

I am not an LTE expert to advise you further.

[Madan Pande]

Hi,
           There is currently no S1 HO implemented inNS-3, though a lot of pre-requisites are already exist...

2. IMHO, what you appear to be trying looks possible but not correct at the same time...

3. All types of Enbs can theoretically connect on X2 interface, but that is not  how FemAP or HeNB  are put in a network...Lena dual-stripe example already uses HeNB  and MacroEnb

4. The HeNB/FemAP are connected in to the network via DSL link or FTTH ...So, what network you would  achieve, I wonder...

With Regards,
madan

---

Date: Sun, 6 Jul 2014 06:19:23 -0700
From: dinos.k...@gmail.com
To: ns-3-...@googlegroups.com
Subject: Re: LTE Handover Procedure

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