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):
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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