7 Functions of PCAP

25.4533GPPRelease 17TSUTRAN Iupc interface Positioning Calculation Application Part (PCAP) signalling

PCAP has the following functions:

– Position Calculation. This function enables the SRNC to interact with an SAS in the process of performing a position estimate of a UE.

– Information Exchange. This function enables the RNC to obtain GPS or GANSS related data from an SAS.

– Reporting of General Error Situations. This function allows reporting of general error situations for which function specific error messages have not been defined.

– SAS Centric Position. This function enables the SRNC to interact with an SAS in the process of performing a position estimate of a UE.

The mapping between the above functions and PCAP elementary procedures is shown in the table 1.

Table 1: Mapping between functions and PCAP elementary procedures

Function	Elementary Procedure(s)
Position Calculation	a) Position Calculation b) Position Parameter Modification c) Abort
Information Exchange	a) Information Exchange Initiation b) Information Reporting c) Information Exchange Termination d) Information Exchange Failure
Reporting of General Error Situations	a) Error Indication
SAS Centric Position	a) Position Initiation b) Position Activation c) Position Parameter Modification d) Abort e) Position Periodic Report f) Position Periodic Result g) Position Periodic Termination