This TS specifies the stage 3 of the Evolved Packet System S101
reference points between the MME and the
HRPD Access Network. The S101
interface supports procedures for Pre-Registration, Session Maintenance and Active
handoffs between E-UTRAN and HRPD networks.
interface supports procedures for
RIM (RAN Information Management) information exchange between the MME and the HRPD Access Network.
It also specifies the S103
interface between the Serving GW and HSGW. This User Plane interface is used to forward
DL data to minimize packet losses in mobility from E-UTRAN to HRPD. Signalling procedures on the S101
are used to set up tunnels on the S103