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ETSI TS 123 402 specifies the stage 2 service description for providing IP connectivity using non-3GPP accesses to theEvolved 3GPP Packet Switched domain. In addition, for E-UTRAN and non-3GPP accesses, the specification describesthe Evolved 3GPP PS Domain where the protocols between its Core Network elements are IETF-based.
ITU-T Recommendation I.130 [2] describes a three-stage method for characterisation of telecommunication services,and ITU-T Recommendation Q.65 [3] defines stage 2 of the method.
The specification covers both roaming and non-roaming scenarios and covers all aspects, including mobility between3GPP and non 3GPP accesses, policy control and charging, and authentication, related to the usage of non-3GPPaccesses.
TS 23.401 [4] covers architecture aspects common to the Evolved 3GPP Packet Switched domain.
The procedures defined in the present document for WLAN access selection and PLMN selection replace thecorresponding I-WLAN procedures specified in TS 23.234 [5].