RE: [rohc] Default decompression algorithms

["Price, Richard" <[e-mail]>]

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> Making one or more of these well-known algorithms mandatory at the 
> decompressor doesn't contradict the UDVM approach because the decision on 
> which algorithm to use (or whether to download a new one) is still made by 
> the compressor. So we have a "win-win" situation; the compressor downloads 
> a new algorithm to the decompressor when it judges the overall performance 
> to be better than using one of the existing algorithms. 
> 
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> Can you suggest how this would be done (implemented) from the compressor end. 
> abbie

Hi,

There are quite a few issues that the compressor will need to consider when
judging overall performance, including some or all of the following metrics:

1   Compression ratio

2   Processing efficiency

3   Memory efficiency

4   Implementation effort

5   IPR considerations

The IPR considerations are particularly important, since encumbered algorithms
tend to substantially outperform unencumbered algorithms in terms of metrics
1, 2, and 3.

So if a compressor has licensed the bytecode for an encumbered algorithm, it
is usually preferable to download this bytecode to a decompressor that does
not support the encumbered algorithm, rather than picking one of the weaker
unencumbered algorithms already available at the decompressor.

Regards,

Richard Price