I did multiple routing in ns2 , I was working on VANET protocol.Still I didn't check in Long term evolution protocols but I think you can do it with through the latest release of ns3.Can go through this documentation , may be can help you.

link- https://www.ietf.org/mail-archive/web/multipathtcp/current/msg00881.html

Best of luck.

I already mentioned that MPTCP is a probable solution. I want another one except MPTCP. 

Hi. First, a few comments:

- "handling multiple interfaces", in this very general formulation, is a feature which is natively supported by ns-3.

- multipath requires multiple interfaces per nodes, yet setting up multiple interfaces per nodes does not necessarily mean you intend to address a multipath problem. E.g.  you may need multiple radios per node to study an advanced scheduling scheme to mitigate interference, or a second interface may be useful to serve as a gateway to/from another network (e.g. see the HNA feature of the OLSR routing protocol).

That being said, I understand your own requirement, which is to know more about multipath implementations in ns-3. Again, it generally depends on which multipath problem you wish to address. E.g. packet reordering is not necessarily in the scope of some multipath solutions. I would advise you delineate your problem more accurately, that will give you more requirement criteria.

Now, for the practical implementations in ns-3. You mentioned MP-TCP. ok. I guess it's the most commonly found multipath stack for ns-3, although not yet merged with the official ns-3 release. Maybe ns-3.27 ?

Anyway, there are other possible multipath solutions, at a routing layer. You may consider the multipath extensions of MANET routing protocols commonly found in ns-3. For instance, one approach would be to start from the OLSR and AODV ns-3 implementation and devise adapted multipath extensions (e.g. MP-OLSR, AOMDV, etc.), optionally getting help from an existing implementation from another simulation tool (e.g. ns2). Or, you may contact the authors who already published simulation results based on a ns-3 multipath implementation. That's the case for instance of the authors of [1], who developed and simulated a ns-3 multipath extension of OLSR, DM-OLSR. You may i) contact them to retrieve the code ii) search similar approaches if you are interested in studying MANET-based multipath schemes.

Regards.

[1] Cervera et al., A multipath routing strategy to prevent flooding disruption attacks in link state routing protocols for MANETs, Journal of Network and Computer Applications, vol. 36 (2) (2013) pp. 744-755.

Thanks a lot  Mr. Laurent Reynaud.