Handover between LTE and WIFI problems

[titikorn tantawutho]

Hi everyone,

My name is Un.

I have a scenario in train environment about the handover between LTE and WIFI. The problems that I found are my mobile router (MR) can connect to Access Point (AP) via WIFI and routing to the destination. However, my MR can't (Maybe) connect to LTE eNodeb but in the terminal show the detail about x2-handover (when the MR is moving pass the eNodeb 1, the terminal show the status that have IMSI and RNTI so if the MR is moving pass the eNodeb 2 , The terminal show the status like the eNodeb 1 and show more the handover mechanism (lena-hanover). But in the visualization (--vis), MR hasn't the green arrow line that connect or routing to the eNodeb. I'm not sure MR is connecting to eNodeb. In MR Routing table has IP's eNodeb and I use the OLSR on MR.

The questions are

1. How can I implement the Handover between LTE and WIFI ?
2. I want my MR connect to the destination via LTE enodeB.

Sorry for the Language.
Un

[Tommaso Pecorella]

Hi Un,

the visualizer (as stated in the manual) doesn't show LTE packets. As a result, you'll not see the green arrows between the node and the eNB.

Beside the pure visualization issue, was you're trying to do is an IP-level handover, and at present we don't have any module in the "core" ns-3 modules supporting such a thing. 

There have been in the past some proposed additions, and for some of them we'll have to resume the review sooner or later (reviewing the modules is an extremely time-consuming thing).

My suggestion is to fist analyze a bit more in detail your scenario, and to identify the protocols you want to use (e.g., MIP, PMIP, whatever). some of them are available through DCE, so there's some hope.

Cheers,

T,

[titikorn tantawutho]

Hi Tommaso,

I would like to say thank you to you for you answers. I didn't know about "the visualizer (as stated in the manual) doesn't show LTE packets. As a result, you'll not see the green arrows between the node and the eNB." before. My concept is like your answer, I want to do IP-level handover from LTE to WIFI by the MR. I am studying and reading the LTE and WIFI Modules that have a class (C++). In my opinion, I think I maybe implemented a new class that has 2 Modules to choose and switch the technology (LTE or WIFI). From your suggestion about the protocols, I think I will use MIP- Network Mobility (NEMO) concept.

Thanks again, for the next step Would you please suggest me , I will use DCE or another ways ?

Un

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[Tommaso Pecorella]

Hi,

MIP is not (yet) implemented in the ns-3 modules. However you can use the ones in Linux kernel through DCE. I'm not a DCE expert tho, so I'd suggest to check the DCE documentation.

cheers,

T.

[Madan Pande]

To just add to what Guru Tommasso said.
    - The 5G approach bases it on PMIPV6, there are a number of papers describing the implementation
approach...assuming you do not propose to use SDN and Openflow...
    - You would need to use non-contiguous CA approach if you donot want a make-after-break...

My two bits...

With Regards,
madan

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[titikorn tantawutho]

Hi Tommaso ,

Thanks for the recommendation. I'm not a DCE expert too and I know a little in DCE so I will check the DCE documentation.

If I have a problem or question, I will ask you later.

Thanks

Un

[titikorn tantawutho]

Hi Madan,

Thank you for your suggestion for the non-contiguous CA approach and a make-after-break.

thanks

UN

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[yad...@tcd.ie]

Dear un,

Have you able to do the handover between the LTE and wifi using dce??