Brief of RANAP Message in PS doamin

Signalling transport shall provide two different service modes for the RANAP.

1.Connection oriented data transfer service.
This service is supported by a signalling connection between RNC and CN domain. It shall be possible to dynamically establish and release signalling connections based on the need. Each active UE shall have its own signalling connection. The signalling connection shall provide in sequence delivery of RANAP messages. RANAP shall be notified if the signalling connection breaks.

2.Connectionless data transfer service. RANAP shall be notified in case a RANAP message did not reach the intended peer RANAP entity.