[Sls-slp] Performance Question concerning ESA proposed TC # retransmit parameter

Kazz, Greg J greg.j.kazz at jpl.nasa.gov
Tue May 12 17:28:11 UTC 2009


The following performance question and use case question has come up concerning the proposed ESA TC # retransmissions parameter:

1) Performance: Has there been any mathematical modeling to help determine what the expected increase in throughput that will likely be for various repeat/re-trans counts over the TC Space Link ? Could it have a significant link-margin consideration as well?

2) Use Case: Also would the number of retransmissions parameter set to greater than one be envisioned for any non-link layer driven scenarios? For example, I think it might be interesting to consider what role this plays in a space internetworking environment.   Presumably this would just be in the link level set of services ... but maybe you want to make sure a key routing table arrives at a particular spacecraft?  Would we ever consider that the spacecraft would implement this between themselves ?



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