Reference ETSI TS 24 301 section 9.9.3.7.
----8----|----7----|----6----|----5----|----4----|----3----|----2----|----1----
| |
Detach type | Switch | Type of
IEI | Off | Detach
| |
----8----|----7----|----6----|----5----|----4----|----3----|----2----|----1----
Type of detach (octet 1)
In UE to network direction:
Bits
3-2-1
0 0 1 EPS detach
0 1 0 IMSI detach
0 1 1 combined EPS/IMSI detach
1 1 0 reserved
1 1 1 reserved
All other values are interpreted as "combined EPS/IMSI detach" in this version of the protocol.
In the network to UE direction:
Bits
3-2-1
0 0 1 re-attach required
0 1 0 re-attach not required
0 1 1 IMSI detach
1 1 0 reserved
1 1 1 reserved
All other values are interpreted as "re-attach not required" in this version of the protocol.
Switch off (octet 1)
In the UE to network direction:
Bit
4
0 normal detach
1 switch off
In the network to UE direction bit 4 is a spare. The network shall set this bit to zero.