Section: 6.1.3.4.3 Abnormal cases
Content: The following abnormal cases can be identified: a) Expiry of timers In the mobile station: On the first expiry of timer T3390, the MS shall resent the message DEACTIVATE PDP CONTEXT REQUEST and shall reset and restart the timer T3390. This retransmission is repeated four times, i.e. on the fifth expiry of timer T3390, the MS shall release all resources allocated and shall erase the PDP context related data. On the network side: On the first expiry of timer T3395, the network shall resent the message DEACTIVATE PDP CONTEXT REQUEST and shall reset and restart timer T3395. This retransmission is repeated four times, i.e. on the fifth expiry of timer T3395, the network shall erase the PDP context related data for that MS. b) Collision of MS and network initiated PDP context deactivation requests If the MS and the network initiated PDP context deactivation requests collide, the MS and the network shall each reply with the messages DEACTIVATE PDP CONTEXT ACCEPT and shall stop timer T3390 and T3395, respectively. c) Network initiated PDP context deactivation request without tear down indicator information element for a default PDP context If an MS supporting S1 mode receives a DEACTIVATE PDP CONTEXT REQUEST message without tear down indicator information element, and the PDP context associated with the specific TI is a default PDP context, the MS shall deactivate the default PDP context as specified in subclause 6.1.3.4.2. Additionally the MS shall deactivate all other active PDP contexts sharing the same PDP address and APN as the default PDP context locally without peer-to-peer signalling. An MS not supporting S1 mode may apply the same behaviour. Figure 6.8/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ] : MS initiated PDP context deactivation procedure Figure 6.9/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ] : Network initiated PDP context deactivation procedure