Re: [EToSat] New Version Notification for draft-lhan-problems-requirements-satellite-net-02.txt

[Raymond Burkholder <[e-mail]>]

On 2022-02-22 1:27 p.m., Arashmid Akhavain wrote:
> I agree that existing IP routing protocols can face convergence issues 
> when it comes to satellite networks. IP and existing routing protocols 
> rely on hierarchy to minimise the impact of link events. 
> Establishing hierarchy in satellite networks can be very complex due 
> to various movements especially when it comes to massive constellations.
>
> In polar constellations, the movement at the poles, and the seam plane 
> will be problematic for existing routing protocols. The issue of 
> course gets exacerbated in the Walker Delta constellation as the 
> seam effect exists between every other orbit.
>
> A new method of routing might be required to address this issue. What 
> are your plans w.r.t to this draft? Have you discussed some of these 
> issues with any of the working groups?
Using standard routing protocols are problematic as they are reactive.  
And due to inter-satellite delays, can take time to re-converge.  I was 
working with a company to come up with an SDN solution where we used TLE 
(Two Line Elements) to compute satellite nearness and then pre-populate 
neighbor entries for installation at pre-arranged times.

In addition, to do this properly, these neighbor entries and routing 
table entries need to be populated based upon distributed path 
computation capabilities (due to the fact that the same ground stations 
are not always in view, and paths need to be adjusted as necessary).

>
> Best regards,
> Arashmid
>
>
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