9/3/2014 9:54 AM, Alper Yegin kirjoitti:
Sri,
On Sep 2, 2014, at 6:32 PM, Sri Gundavelli (sgundave) wrote:
Alper -
> The idea is to make sure the simultaneous PDN connections do not
keep adding up each time the UE encounters a new GW.
Is that not truly a deployment consideration ?
Supporting #N simultaneous PDN connections per UE has implications on
the systems.
So, it's not really only about deployment considerations.
The 3GPP system is able to support up to 11 PDN Connections (or any
bearers to be precise). This limit is on both UE and network side. What
I cannot now remember on top of my head is whether the limitation is
just per UE-PGW pair. Need to check that.
So, it also means the maximum number of prefixes per UE in 11.. unless
prefix delegation is used (but in that case the prefixes are not for the
UE but the LAN side nodes).
If the approach is gateway selection based on application/CN basis,
can the network control this ?
Not sure how to answer that. Probably this can be discussed in the
context of a specific solution….
Network should be able to control this. If not, it will be added most
probably.
- JOuni
Alper
Regards
Sri
From: Alper Yegin <[email protected] <mailto:[email protected]>>
Date: Monday, September 1, 2014 7:39 AM
To: Marco Liebsch <[email protected]
<mailto:[email protected]>>
Cc: "[email protected] <mailto:[email protected]>" <[email protected]
<mailto:[email protected]>>
Subject: Re: [DMM] 3GPP CSIPTO
Hi Marco,
thanks for posting the update. One clarifying question on the
following service requirement:
‘/The 3GPP system shall minimize the number of connections of a UE
without disrupting the
UE’s services, e.g. to ensure economical use of network resources/’
Can this be understood as the number of connections, which is to be
minimized, is equal to the
number of mobility session and associated IP addresses?
You can say that.
The idea is to make sure the simultaneous PDN connections do not keep
adding up each time the UE encounters a new GW.
Alper
Is this to minimize the states in the network, or is the intention to
limit the control-plane
signaling with the mobile device to setup/teardown the connection?
Thanks for your feedback in advance,
marco
*From:*dmm [mailto:[email protected]]*On Behalf Of*Alper Yegin
*Sent:*Montag, 1. September 2014 09:51
*To:*[email protected] <mailto:[email protected]>
*Subject:*[DMM] 3GPP CSIPTO
Dear DMMers,
Here's an update on 3GPP SA1 CSIPTO work…
Two weeks ago there was an SA1 meeting (SA1#67), and in that meeting
SA1 has completed the CSIPTO normative work.
As you might remember, SA1 is in charge of defining service requirements.
The next step for CSIPTO is to initiate a work item in SA2.
And here's a copy-paste of the normative requirements (accepted doc
is S1-143607.zip
<http://www.3gpp.org/ftp/tsg_sa/WG1_Serv/TSGS1_67_SophiaAntipolis/docs/S1-143607.zip>):
Some types of services (e.g. streaming services, VOIP, VPN,
HTTPS-Based Services) cannot tolerate a change of IP address of the
UE without disruption of the service.
SIPTO can be performed with or without coordination between the UE
and the network. The following requirements apply to coordinated SIPTO:
-The 3GPP system shall be able to support multiple connections that
are associated with the same defined IP network where each connection
may or may not support IP address preservation.
-The 3GPP system shall be able to determine if an IP flow requires IP
address preservation or not. Based on this determination, the 3GPP
network shall be able to offload selected IP traffic in coordinated
manner between UE and the network, in order to minimize service
disruption.
-The 3GPP system shall be able to detect when a connection becomes
suboptimal and decide when to establish a new optimal connection to
the same defined IP network or use an existing connection.
Note 1: The definition of optimal and suboptimal can be based on
a number of implementation criteria like geography, topology and load
balancing etc.
-The 3GPP system shall minimize the number of connections of a UE
without disrupting the UE’s services, e.g. to ensure economical use
of network resources.
-The 3GPP system shall be able to ensure that the actual average
aggregate bit rate for IP flows of packet data network connections
associated with the same packet data network does not significantly
exceed the subscribed aggregate maximum bit rate for this packet data
network when two connections are used with the same defined IP network.
Note 2: Requirements for Coordinated SIPTO do not apply to IMS.
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