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Newsgroups: comp.protocols.misc
Date: Wed, 23 Jan 2013 19:07:14 -0800 (PST)
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Subject: Re: GTPv0 , GTPv1 and GTPv2
From: stephen.yin.h@gmail.com
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Xref: csiph.com comp.protocols.misc:55

=E5=9C=A8 2009=E5=B9=B44=E6=9C=886=E6=97=A5=E6=98=9F=E6=9C=9F=E4=B8=80UTC+8=
=E4=B8=8B=E5=8D=8811=E6=97=B612=E5=88=8628=E7=A7=92=EF=BC=8Ckarthikbalaguru=
=E5=86=99=E9=81=93=EF=BC=9A
> Hi,
>=20
> What is the difference between GTPv0 & GTPv1 & GTPv2 ?
> I do not find any specific link for the differences between
> the above 3 versions of GTP .
>=20
> I find only the below info . Is there any other explicit
> information w.r.t differences between  GTPv0 and
> GTPv1 and GTPv2  ?
>=20
> "
> GTP was originally standardized within ETSI (GSM standard 09.60). With
> the creation of the UMTS standards this was moved over to the 3GPP
> which, as of 2005 maintains it as 3GPP standard 29.060. GTP' uses the
> same message format, but its special uses are covered in standard
> 32.295 along with the standardized formats for the charging data it
> transfers.
>=20
> Later versions of TS 29.060 deprecate GTPv1/v0 interworking such that
> there is no fallback in the event that the GSN does not support the
> higher version.
>=20
> GTPv2 (for evolved packet services) went into draft in early 2008 and
> was released in December of that year. GTPv2 offers fallback to GTPv1
> via the earlier "Version Not Supported" mechanism but explicitly
> offers no support for fallback to GTPv0.
> "
>=20
> Thx in advans,
> Karthik Balaguru

There is no major difference between v1 and v2 header apart from introducin=
g the new fields in v2 and the removal of Extension-header, Flags for Seque=
nce number and N-PDU.
Piggy backing Flag - When this flag is set in create session response then =
it means there is a create bearer request which is piggybacked in the same =
GTP message.
Since GTPv2-C is designed for Control, there is no need to have a N-PDU whi=
ch is required during Inter RAT RAU.
TEID need not be present in the case of GTP Echo messages. So this is strip=
ped in v2.
Sequence number field is mandatory in V2.