Re: Rohc Digest, Vol 54, Issue 4

Pradeep,

pradeep shambhu wrote:
> Changing fields can be made as a static in only one condition, that is
> if the bits are increasing in the sequential order. 
No. Header fields can only be encoded as static, if it hasn't changed
since the last header. Otherwise the format will fail.

> The offset value can be set & can be considered as a static.
I am not sure what you mean here.

> But for the fields of TCP like checksum, urgent pointer, control fields
> are always irregular, then how can the fields can be set as a static. (
> as mention in the Rfc - 4996 page.no-79 ) &  Irregular ( Rfc - 4413
> page.no <http://page.no> 18 ).

The TCP checksum is always sent in the irregular, dynamic or replicate
chain and is encoded with irregular(16). Urgent pointer is encoded using
static_or_irreg, which means it is encoded static or irregular (not
always irregular). Be a bit more specific about the controllfields. I
can't see any problem with the choice static_or_irreg as encoding method
for these fields.

/Calle