Section: 6.1.3.4.1 PDP context deactivation initiated by the MS
Content: In order to deactivate a PDP context, the MS sends a DEACTIVATE PDP CONTEXT REQUEST message to the network, enters the state PDP-INACTIVE-PENDING and starts timer T3390. The message contains the transaction identifier (TI) in use for the PDP context to be deactivated and a cause code that typically indicates one of the following causes: # 25: LLC or SNDCP failure (A/Gb mode only); # 26: insufficient resources; # 36: regular deactivation; or # 37: QoS not accepted. The network shall reply with the DEACTIVATE PDP CONTEXT ACCEPT message. Upon receipt of the DEACTIVATE PDP CONTEXT ACCEPT message, the MS shall stop timer T3390. In A/Gb mode, both the MS and the network shall initiate local release of the logical link if it is not used by another PDP context. In Iu mode, the network shall initiate the release of Radio Access Bearer associated with this PDP context. If the selected Bearer Control Mode is 'MS/NW' the MS should not deactivate a PDP context, if it is the only PDP context without TFT within a group of active PDP contexts sharing the same PDP address and APN. NOTE 1: A configuration with more than one PDP context without TFT within a group of active PDP contexts sharing the same PDP address and APN can occur during a network initiated PDP context modification due to asynchronous TFT states in the MS and in the network (see e.g. subclause 6.1.3.3.4 bullet a.3 in the description of the TFT checks). NOTE 2: If the MS deactivates the last remaining PDP context without TFT within a group of active PDP contexts sharing the same PDP address and APN, a network implementing this version of the protocol will deactivate all other active PDP contexts sharing the same PDP address and APN by explicit peer-to-peer signalling; a network compliant with earlier versions of the protocol can initiate the re-establishment of this PDP context using the network requested secondary PDP context activation procedure.