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Re: [Question #243652]: About the feedback channel

 

Question #243652 on rohc changed:
https://answers.launchpad.net/rohc/+question/243652

    Status: Open => Answered

Didier Barvaux proposed the following answer:
Hello,

All links may have feedback channels. Some link types make this easier
than others. Bidirectional links such as Ethernet, ADSL, ISDN can easily
have a feedback channel. Unidirectional links such as unidirectional
satellite cannot have a feedback channel, except if they are associated
with an additional return link (ADSL, ISDN...).

The ROHC protocol was designed to work for both unidirectional and
bidirectional links. ROHC handles unidirectional links with an
additional return link the same way it handles bidirectional links.
Please note that ROHC can work in unidirectional mode on a bidirectional
link if one wishes to do so. In your multicast example, you may use no
return link or use a unicast return link as you wish.

A developer tells the ROHC library to work in bidirectional mode by
associating a ROHC compressor object to a ROHC decompressor object upon
decompressor creation. If NULL is given, the unidirectional mode is
used. If a valid object is given, the bidirectional mode will be used.

Regards,
Didier

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