Re: [Rohc] use of "Bidirectional Optimistic mode (O-mode)"

[Didier Barvaux]

Hello,

> Sorry for early alert, I found the answers from previous mails. But
> now lets ask difference between R-Mode and O-Mode.
> 
> As I read from rfc 3095 R-Mode context updates is more robust then
> O-mode. Does context update mean sending IR type rohc packets ? Or
> sending newly created context information to decompressor which is
> done once?
>
> Are there any other differences between O-mode and R-mode?

In both modes, context updates are done with IR or IR-DYN packets.
Those IR/IR-DYN packets are repeated several times until the compressor
gains confidence that the decompressor got the update.

The R and O modes vary on the way to gain that confidence:
 * In R-Mode, the compressor gains confidence if it receives an
   acknowledgement of at least one of those IR/IR-DYN packets from the
   decompressor.
 * In O-Mode, the compressor gains confidence in two ways, the first
   one to occurs is enough:
* if it receives an acknowledgement of at least one of those
  IR/IR-DYN packets from the decompressor.
* if it sends N IR/IR-DYN packets in a row (N is not defined in
  the standard, but left to implementers).

The threshold N is not yet configurable in the ROHC library. It is
defined to 3. It is planned to change that in the near future.


> As read from documentation r-mode is still not implemented. Is that
> true? Is there any plan to implement in the future?

R-Mode is not yet implemented in the ROHC library. There is plan to
implement it in the near future for the moment. If you are interested
in adding R-Mode support, I may help you however.

Regards,
Didier

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Re: [Rohc] use of "Bidirectional Optimistic mode (O-mode)"

[mehmet sulak]

Sorry for early alert, I found the answers from previous mails. But now
lets ask difference between R-Mode and O-Mode.

As I read from rfc 3095 R-Mode context updates is more robust then O-mode.
Does context update mean sending IR type rohc packets ? Or sending newly
created context information to decompressor which is done once?

Are there any other differences between O-mode and R-mode?

As read from documentation r-mode is still not implemented. Is that true?
Is there any plan to implement in the future?


Best Regards...




2018-03-13 10:54 GMT+03:00 mehmet sulak :

> Hi to all,
>
> I want to use  "Bidirectional Optimistic mode (O-mode)" of the rohc
> library but I could not find enough documentation about how to use.
> Actually the thing that I wonder is how feedback channel works.
> How feedback data that is produced in decompressor, is send back to
> compressor. Do I need to use some methods to get feedback data and send
> back to compressor?
>
> Best Regards..
>
>
>
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