4G/LTE - Attach Type |
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Attach Type
The Attach Type indicates the purpose of the attach and as in most of other procedure, the attach type is also determined by a kind of mutual agreement between UE and Network. It means that UE indicates the attatch type I want to get and Network finaly determines available attach type and informs it to UE as in following procedure. There are three different types of attach as listed below.
NAS EPS Mobility Management Message Type: Attach request (0x41) 0... .... = Type of security context flag (TSC): Native security context (for KSIasme) .100 .... = NAS key set identifier: (4) .... 0... = Spare bit(s): 0x00 .... .010 = EPS attach type: Combined EPS/IMSI attach (2) EPS mobile identity Length: 11 .... 0... = odd/even indic: 0 .... .110 = Type of identity: GUTI (6) Mobile Country Code (MCC): Unknown (1) Mobile Network Code (MNC): Unknown (01) MME Group ID: 32769 MME Code: 0 M-TMSI: 0x00000001 UE network capability Length: 4 1... .... = EEA0: Supported .1.. .... = 128-EEA1: Supported ..1. .... = 128-EEA2: Supported ...0 .... = 128-EEA3: Not Supported .... 0... = EEA4: Not Supported .... .0.. = EEA5: Not Supported .... ..0. = EEA6: Not Supported .... ...0 = EEA7: Not Supported 0... .... = EIA0: Not Supported .1.. .... = 128-EIA1: Supported ..1. .... = 128-EIA2: Supported ...0 .... = 128-EIA3: Not Supported .... 0... = EIA4: Not Supported .... .0.. = EIA5: Not Supported .... ..0. = EIA6: Not Supported .... ...0 = EIA7: Not Supported 1... .... = UEA0: Supported .1.. .... = UEA1: Supported ..0. .... = UEA2: Not Supported ...0 .... = UEA3: Not Supported .... 0... = UEA4: Not Supported .... .0.. = UEA5: Not Supported .... ..0. = UEA6: Not Supported .... ...0 = UEA7: Not Supported 0... .... = UCS2 support (UCS2): The UE has a preference for the default alphabet .1.. .... = UMTS integrity algorithm UIA1: Supported ..0. .... = UMTS integrity algorithm UIA2: Not Supported ...0 .... = UMTS integrity algorithm UIA3: Not Supported .... 0... = UMTS integrity algorithm UIA4: Not Supported .... .0.. = UMTS integrity algorithm UIA5: Not Supported .... ..0. = UMTS integrity algorithm UIA6: Not Supported .... ...0 = UMTS integrity algorithm UIA7: Not Supported
NAS EPS Mobility Management Message Type: Attach accept (0x42) 0000 .... = Spare half octet: 0 .... 0... = Spare bit(s): 0x00 .... .010 = Attach result: Combined EPS/IMSI attach (2) GPRS Timer - T3412 value GPRS Timer: timer is deactivated 111. .... = Unit: value indicates that the timer is deactivated (7) ...0 0000 = Timer value: 0 Tracking area identity list - TAI list Length: 6 0... .... = Spare bit(s): 0x00 .00. .... = Type of list: list of TACs belonging to one PLMN, with non-consecutive TAC values (0) ...0 0000 = Number of elements: 0 [+1 = 1 element(s)] Mobile Country Code (MCC): Unknown (1) Mobile Network Code (MNC): Unknown (01) Tracking area code(TAC): 0x0001
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