Section: 6.1.3.4 PDP context deactivation procedure
Content: The purpose of this procedure is to deactivate an existing PDP context between the MS and the network. The PDP context deactivation may be initiated by the MS or by the network. The tear down indicator information element may be included in the DEACTIVATE PDP CONTEXT REQUEST message in order to indicate whether only the PDP context associated with this specific TI or all active PDP contexts sharing the same PDP address and APN as the PDP context associated with this specific TI shall be deactivated. If the tear down is requested, all other active PDP contexts sharing the same PDP address and APN as the PDP context associated with this specific TI shall be deactivated locally without peer-to-peer signalling. In this case, the network should not include WLAN offload indication in the DEACTIVATE PDP CONTEXT REQUEST message, and if the UE receives the WLAN offload indication, the UE shall ignore the indication. If the tear down indicator information element is not included in the DEACTIVATE PDP CONTEXT REQUEST message, only the PDP context associated with this specific TI shall be deactivated. For an exception when the PDP context is a default PDP context and there are other active PDP contexts sharing the same PDP address and APN, see subclause 6.1.3.4.3. An MS supporting S1 mode shall always include the tear down indicator when deactivating the default PDP context. An MS not supporting S1 mode should apply the same behavior (see 3GPP TS 23.060[ General Packet Radio Service (GPRS); Service description; Stage 2 ]  [74]). Local deactivation of a NBIFOM multi-access PDN connection can be triggered by an NBIFOM procedure (see 3GPP TS 24.161[ Network-Based IP Flow Mobility (NBIFOM); Stage 3 ]  [158]). If such a trigger is received then the associated PDP contexts mentioned in this specification shall be deactivated locally without peer-to-peer signalling. After successful PDP context deactivation, the associated NSAPI and TI values are released and can be reassigned to another PDP context. If one or more MBMS contexts are linked to a PDP context that has been deactivated, the MS shall deactivate all those MBMS contexts locally (without peer to peer signalling between the MS and the network). The MS is allowed to initiate the PDP context deactivation procedure even if the timer T3396 is running.