Hi, > I have a general question about the no compression profile (0). > > How does the compressor decide on using it? should there be some kind > of indication from upper layers telling the compressor to use profile > 0 to compress the packet? or the other profiles must be deactivated > on the channel before sending the packet, so the compressor finds > only profile 0 to use?
There are 2 possibilities in the ROHC library: - If no other compression profile matches the packet, then the uncompressed profile is selected. - If the compression of the packet fails with the selected compression profile, then the compressor tries again with the uncompressed profile. > I know that some packets that are rarely appear on the link, get sent > with profile 0 to save memory resources needed for a new context, The ROHC library does not handle such case. > but my question is for normal IP packets, if i want to test rohc > without doing any compression, only CRC in IR packets and CID octet > (if cid != 0) and the optional feedback to trigger transition to > bidirectional mode,...etc. If you want to use only the uncompressed profile, then enable only the uncompressed profile with the rohc_activate_profile() function. See the API description: http://www.tech.viveris.com/docs/rohc/group__rohc__comp.html#g1a444eb91681521f726712a60a4df867 See an example here: http://bazaar.launchpad.net/~didier-barvaux/rohc/main/annotate/head:/examples/simple_rohc_program.c#L102 Regards, Didier Barvaux
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