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EPS update type value (octet 1, bit 1 to 3)

Bits

3 2 1
0 0 0 TA updating
0 0 1 combined TA/LA updating
0 1 0 combined TA/LA updating with IMSI attach
0 1 1 periodic updating
1 0 0 unused; shall be interpreted as "TA updating", if received by the network.
1 0 1 unused; shall be interpreted as "TA updating", if received by the network.

All other values are reserved.

"Active" flag (octet 1, bit 4)
Bit

4
0 No bearer establishment requested
1 Bearer establishment requested