PDP
Click on the red underlined text to get to the source
... primary recommendations contained in this document, allocating a
unique prefix to each primary PDP context when IPv6 stateless address
autoconfiguration is used, and allowing the terminals ...
... handset.
PDP Packet Data Protocol
...
... UE and the GGSN, over which
the packets are transferred. There are two kinds of PDP Contexts --
primary, and secondary.
...
... GGSN. For
instance, an IP address is assigned to each primary PDP Context. In
addition, one or more secondary PDP ...
... PDP Contexts can be added to a
primary PDP Context, sharing the same IP address. These secondary
...
... Context, sharing the same IP address. These secondary
PDP Contexts can have different Quality of Service characteristics
...
... Contexts can have different Quality of Service characteristics
than the primary PDP Context.
...
... GPRS links are point-to-
point. Once activated, all PDP contexts have equal status, meaning
that a primary PDP ...
... PDP contexts have equal status, meaning
that a primary PDP context can be deleted while keeping the link ...
... UE and the GGSN, as long as there are other (secondary)
PDP contexts active for the same IP address ...
... and PPP. This document will only discuss the IPv6 PDP Type.
There are three basic actions that can be performed on a PDP ...
... PDP Context:
PDP Context Activation, Modification, and Deactivation. These
actions are described in the following.
...
... address autoconfiguration has the following steps:
1. The Activate PDP Context message is sent to the SGSN (PDP ...
...
Each connected handset or laptop will create a primary PDP context
for communication on the Internet ...
... Internet. A handset may create many primary
and/or secondary PDP contexts throughout the life of its connection
...
... the handset, and these two items are assembled into a single IPv6
address. Later, the GGSN modifies the PDP context entry in the SGSN
...
... address is also used in the GGSN to identify the PDP context
associated with each packet. It is assumed that 3GPP ...
... 2. Require that a given prefix must not be assigned to more than
one primary PDP context, and
...
... 3GPP allow multiple prefixes to be advertised for
each primary PDP context. This would have several advantages,
including:
...
... WG recommends that one or more /64 prefixes should be assigned
to each primary PDP context. This will allow sufficient address
space for a 3GPP ...
...
If an operator assigns a /64 per PDP context, can we be assured that
there is enough address space ...
...
Using these assumptions, a total of 490 trillion (490x10^12) /64
prefixes can be assigned. This translates into around 80,000 PDP
Contexts per person on the earth today. Even assuming that a
...
... IPv6 address space
will not be exhausted if /64 prefixes are allocated to primary PDP
contexts.
...
... SGSN be informed of each prefix that is
currently assigned to a PDP context. By assigning a prefix to only
...
... context. By assigning a prefix to only
one primary PDP context, the SGSN can associate a prefix ...
... IPv6 WG should consider publishing an "IPv6 over PDP Contexts"
(or similar) document. This document would be useful for developers
...
...
In order to allow for the configuration and use of multiple IPv6
addresses per primary PDP Context having different interface
identifiers, some modifications to the current 3GPP ...
...
b) The assignment may be performed by building "prefix
delegation" functionality into the PDP Context messages or
by using layer 3 ...
... GGSN would have a
certain number of /64 prefixes that can be handed out at PDP context
Activation, through Router Advertisements ...
... Router Advertisements. Therefore, instead of
using the full IPv6 address to identify a primary PDP context, the
IPv6 ...
... SGSN be informed of the
prefixes that are assigned to a PDP context. By assigning a given
prefix ...
... However, this is not necessary if each device behind the MT is
connected to a separate primary PDP Context and therefore can use a
/64, which is not shared with other devices. The MT ...