Re: [rohc] Liaison towards 3GPP

["Lars-Erik Jonsson" <lars-erik.jonsson@ericsson.com>]

Comments below...

>> Are you sure about this. If the IP ID is non-sequential as it commonly
>> is, I am pretty sure it will be stripped and reproduced without
>> preserving the original value. Hence, violation of IP integrity.
>>
>I would regard this as a non essential field, since
>it's used for idetification of a packet, useful when
>reassembilng its fragments, and it seems to me no fragments
>of an IP packet carrying a voice frame is expected at the
>other en of the wireless channel when RTP/UDP/IP header is stripped.
>
>>From an engineering point of view, the IPv4 ID integrity
>does not matter when the header is stripped.


OK, I understand your point and the IP ID is really a troublesome field from a
HC point of view because it is in many cases "useless". However, it is there and
to not violate the integrity of the packet, it must be transparently transmitted
over the link. Above, you made a simplification by talking about voice frames
that you can not do. A packet is a packet and its integrity must be preserved no
matter what is carried in it.

/Lars-Erik