Re: [manet] Some comments on draft-funkfeuer-manet-olsrv2-etx-01

[Henning Rogge <[e-mail]>]

On Mon May 23 2011 19:46:46 Abdussalam Baryun wrote:
> > > > How can packet sizes of lost packets be measured?
> > > 
> > > Maybe with a second packet sequence number that is only increased for
> > > 
> > > large packets ?
> 
> If we want exact information it seems that the source or dest_nieghbours
> may inform the destination of the lost packets sizes if requested by the
> destination. The source should be able to list all the sent packets SQ
> number with its size index by the packets destinations. The destination
> sends to source a request of the sizes of packets (using special packet
> for measure).
This might require a huge amount of data inside the packages because long 
bursts of packages might be lost.
 
> Or more simple method can be called the size SQ method proposed above, so
> the source, path_nodes and destination are counting the packet by possible
> categorized of size information/measured. We may have second/third/more
> sequence (size_sequence) in three or four as very large, large, medium,
> small. Therefore, when the dest size sequence count is different from the
> source it will notice the lost and measure the size.

On Tue May 24 2011 15:37:30 Georg Wittenburg wrote:
> Hi Henning, all,
> 
> I see. And I agree with you that in this case you would indeed need a
> second counter just for relevant packets. Possibly another TLV, if the
> overhead is acceptable.
I think it should be acceptable, we might even get away with a single byte 
sequence number, because we can detect overflows (more than 255 lost packages) 
with the help of the default package number.

Links which lost 200+ packages in a row would most likely be considered very 
bad anyways.

Henning Rogge
-- 
Diplom-Informatiker Henning Rogge , Fraunhofer-Institut für
Kommunikation, Informationsverarbeitung und Ergonomie FKIE
Kommunikationssysteme (KOM)
Neuenahrer Straße 20, 53343 Wachtberg, Germany
Telefon [phone],   Fax [phone]
mailto:[e-mail] http://www.fkie.fraunhofer.de
GPG: E1C6 0914 490B 3909 D944 F80D 4487 C67C 55EC CFE0