Section: 4.1.3.2 GPRS update status
Content: In addition to the GMM sublayer states described so far, a GPRS update status exists. The GPRS update status pertains to a specific subscriber embodied by a SIM/USIM. This status is defined even when the subscriber is not activated (SIM/USIM removed or connected to a switched off ME). It is stored in a non volatile memory in the SIM/USIM. The GPRS update status is changed only after execution of a GPRS attach, combined GPRS attach, network initiated GPRS detach, authentication, service request, paging for GPRS services using IMSI, routing area updating, combined routing area updating procedure or due to change in RAI while timer T3346 running. GU1: UPDATED The last GPRS attach or routing area updating attempt was successful (correct procedure outcome, and the answer was accepted by the network). The SIM/USIM contains the RAI of the routing area (RA) to which the subscriber was attached, and possibly a valid P-TMSI, GPRS GSM ciphering key, GPRS UMTS ciphering key, GPRS UMTS integrity key and GPRS ciphering key sequence number. Furthermore, if the ME supports any GEA ciphering algorithm that requires a 128-bit ciphering key and a USIM is in use, then the ME may contain a valid GPRS GSM Kc128. Furthermore, if the ME supports any GIA integrity algorithm that requires a 128-bit integrity key and a USIM is in use, then the ME may contain a valid GPRS GSM Kint. GU2: NOT UPDATED The last GPRS attach or routing area updating attempt failed procedurally, e.g. no response was received from the network. This includes the cases of failures or congestion inside the network. In this case, the SIM/USIM can contain the RAI of the routing area (RA) to which the subscriber was attached, and possibly also a valid P-TMSI, GPRS GSM ciphering key, GPRS UMTS ciphering key, GPRS UMTS integrity key and GPRS ciphering key sequence number. For compatibility reasons, all these fields shall be set to the "deleted" value if the RAI is deleted. However, the presence of other values shall not be considered an error by the MS. Furthermore, if the ME supports any GEA ciphering algorithm that requires a 128-bit ciphering key and a USIM is in use, then the ME shall delete the GPRS GSM Kc128 stored if the RAI is deleted. Furthermore, if the ME supports any GIA integrity algorithm that requires a 128-bit integrity key and a USIM is in use, then the ME shall delete the GPRS GSM Kint stored if the RAI is deleted. GU3: ROAMING NOT ALLOWED The last GPRS attach or routing area updating attempt was correctly performed, but the answer from the network was negative (because of roaming or subscription restrictions). In this case, the SIM/USIM can contain the RAI of the routing area (RA) to which the subscriber was attached, and possibly also a valid P-TMSI, GPRS GSM ciphering key, GPRS UMTS ciphering key, GPRS UMTS integrity key or GPRS ciphering key sequence number. For compatibility reasons, all these fields shall be set to the value "deleted" if the RAI is deleted. However, the presence of other values shall not be considered an error by the MS. Furthermore, if the ME supports any GEA ciphering algorithm that requires a 128-bit ciphering key and a USIM is in use, then the ME shall delete the GPRS GSM Kc128 stored if the RAI is deleted. Furthermore, if the ME supports any GIA integrity algorithm that requires a 128-bit integrity key and a USIM is in use, then the ME shall delete the GPRS GSM Kint stored if the RAI is deleted. If the MS is attached for emergency bearer services, the MS shall not store the GMM parameters described in this subclause on the SIM/USIM or in non-volatile memory. Instead the MS shall temporarily store these parameters locally in the ME and the MS shall delete these parameters when the MS is detached.