10.2 Protocol Discriminator

04.083GPPMobile radio interface Layer 3 specificationRelease 1998TS

The Protocol Discriminator (PD) and its use are defined in 3GPP TS 04.07 [20]. 3GPP TS 04.08 defines the protocols relating to the PD values:

bits 4 3 2 1

0 0 1 1 Call Control; call related SS messages
0 1 0 1 Mobility Management messages for non-GPRS services
0 1 1 0 Radio Resource management messages

1 0 0 0 Mobility Management messages for GPRS services

1 0 1 0 Session Management messages

except the call related SS procedures, which are defined in 3GPP TS 04.10.