rohc

processing time for rohc

Asked by Imad J. Mohamad

I'm sorry if my question not relevant. I'm looking for information and found your forum is specialist.
Any link or reference i can read to find such information.

RoHC Implementation is marked in utilizing the bandwidth and improved the delay.I wand to understand and analyze the delay.

let end to end delay for VoIP = processing delay + propagation delay + queuing delay + transmission delay
Please In terms of processing delay and queuing delay. My i ask

1- How much RoHC adds processing delay or overhead (for VoIP for example) to the compressor node (router) and to decompress-or node (router) as a ratio for each served packet..

2- How much RoHC reduced the queuing delay (as a ratio) in the compressor node and to decompress-or node.

I'm sorry if my question is not relevant to fourm interest. I'm looking for information and found your forum is specialist.
Any link or reference i can read to find such information.

Thank you in advance
Imad

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Cedric Baudoin (cedric-baudoin) said : 		#1

Hi,

The delay is somehow related to the link layer technologies. Let me explain
: if you consider a satellite access, using ATM at layer 2, your VoIP
packets will be segmented into 2 ATM cells. These kinds of access control
the bandwidth using a radio ressource management protocol based on requests
emitted by the terminals and a Network control center that collects the
requests and calculate the MF-TDMA allocation plan used by the terminal to
emit their layer 2 packets. With this scheme, the 2 cells can be emitted
separetly (i.e. on different frames) leading to an increased delay. Now,
using ROHC you will be able to have only 1 cell to transport your VoIP
pakct, leading to a reduction of the delay at layer 2

Best regards

Cédric

2010/7/1 Imad J. Mohamad <email address hidden>

> New question #116322 on rohc:
> https://answers.launchpad.net/rohc/+question/116322
>
> I'm sorry if my question not relevant. I'm looking for information and
> found your forum is specialist.
> Any link or reference i can read to find such information.
>
> RoHC Implementation is marked in utilizing the bandwidth and improved the
> delay.I wand to understand and analyze the delay.
>
> let end to end delay for VoIP = processing delay + propagation delay +
> queuing delay + transmission delay
> Please In terms of processing delay and queuing delay. My i ask
>
> 1- How much RoHC adds processing delay or overhead (for VoIP for example)
> to the compressor node (router) and to decompress-or node (router) as a
> ratio for each served packet..
>
> 2- How much RoHC reduced the queuing delay (as a ratio) in the compressor
> node and to decompress-or node.
>
> I'm sorry if my question is not relevant to fourm interest. I'm looking for
> information and found your forum is specialist.
> Any link or reference i can read to find such information.
>
> Thank you in advance
> Imad
>
>
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