4 General

24.1613GPPNetwork-Based IP Flow Mobility (NBIFOM)Release 17Stage 3TS

This document specifies the following procedures for Network-Based IP Flow Mobility (NBIFOM) as specified in 3GPP TS 23.161 [2] between the User Equipment (UE) and the network. The present document specifies the following procedures for support of NBIFOM in clause 5:

a) Initial PDN connection establishment procedure;

b) Extending NBIFOM traffic flows to additional access network;

c) IP flow mobility between 3GPP and WLAN;

d) Removal of an access from a PDN connection;

e) IP flow mapping procedures;

f) Handling of change of access usability; and

g) Handling of Access stratum indication.

For a), b), e), f) and g), the procedures are always initiated by the UE. Specifically, for e) and g), the procedures are performed only if the network-initiated NBIFOM mode is selected as specified in subclause 5.4 of 3GPP TS 23.161 [2].

For c), the procedure is initiated by:

– the UE if the UE-initiated NBIFOM mode is selected as specified in subclause 5.4 of 3GPP TS 23.161 [2]; or

– the network if the network-initiated NBIFOM mode is selected as specified in subclause 5.4 of 3GPP TS 23.161 [2].

For d), the procedure may be initiated by the UE or the network.

This document also defines the coding of the PDUs and parameters for NBIFOM in clause 6.