Self routing

[Ghassane Aniba <Ghassane.Aniba@sophia.inria.fr>]

Hi,
i've a remark:
if we have 96% of traffic with 1500 or 576 bytes, and 40 or 48 bytes, we
found this:

if we use the SNDU encapsulation ( + 8 bytes for each IP packet), we
will have this results:

148 bytes free  ----->  1508 bytes (9 * 184 bytes)

152 bytes free  ----->   584 bytes (4*184 bytes)

128 bytes free  ----->   56 bytes ( 1 * 184 bytes)

136 bytes  free ----->   48 bytes ( 1 * 184 bytes)

this results confirm that we have enough space for adding our labels.
Although, if we though about using a pointer, and a @ling_sat for each
fragment of SNDU, we will have other results.

I'm thinking about adding another label, to the @link_sat_adress (I know
that most of us, will say that's a lot of overhead, but i'm sur that it
will be interesting).
The name of label, will be " label_sitching". if you remember the
descriptor which i've proposed, we foung this field.
For each MPEG2-TS packet we will add 4 bytes, for this new label. We
suppose that we have in maximum 32 spots. Each bit of the
label_switching in the MPEG2-TS packet, will specify if this spot is
concerned by this packet of not.
So, we will eliminate the switching table from satellite, and having in
her place, a smaller tables in each terrestrial terminal.

|---------------|------------|-----------------|------------------|
| Mpeg2 Header  | @link_sat  | label_switching |  SNDU fragment   |
|---------------|------------|-----------------|------------------|
     4 bytes       3 bytes        4 bytes             177 bytes

With this new label, we will find that the nombre of MPEG2-TS packet for
each SNDU didn't change.

Aniba.


-- 
Ghassane ANIBA
INRIA (Projet PLANETE)             | Email :
ghassane.aniba@sophia.inria.fr  
2004, Route des Lucioles BP 93     | Phone : +33 4 92 38 75 63
06902 Sophia Antipolis CEDEX France| Fax   : +33 4 92 38 79 78