4 General

29.2763GPP3GPP Evolved Packet System (EPS)Optimized handover procedures and protocols between E-UTRAN access and cdma2000 HRPD AccessRelease 17Stage 3TS

The S101 and S121 reference points are defined between the MME and the HRPD access, enabling interactions between E-UTRAN Access and cdma2000 HRPD Access. The S101 interface is required to perform procedures related to optimise HO from the E-UTRAN Access to cdma2000 HRPD Access to allow for pre-registration and handover signalling with the target system. The S121 interface is required to perform procedures related to RIM information exchange between the E-UTRAN Access and cdma2000 HRPD Access.

The S103 interface is defined between the Serving GW and HSGW and supports the forwarding of DL data during mobility from E-UTRAN to HRPD. Signalling procedures on the S101 interface are used to set up tunnels on the S103 interface.

The requirements for these interfaces are defined in 3GPP TS 23.402 [2].

The protocol stack used for the S101 and S121 interfaces shall be based on GTPv2-C, see 3GPP TS 29.274 [6] Figure 4.2.0-1.

The UDP header and port numbers definitions shall be as defined in GTPv2-C, see 3GPP TS 29.274 [6] section 4. 2.1.

The IP header and IP addresses definitions shall be as defined in GTPv2-C, see 3GPP TS 29.274 [6] section 4.2.2.

Layer 1 and Layer 2 requirements shall as defined in GTPv2-C, see 3GPP TS 29.274 [6] sections 4.2.3 and 4.2.4.