S2a  It provides the user plane with relatedcontrol and mobility support between trusted non 3GPP IP access andthe Gateway.

可信non-3GPP中,TWAG3GPP网关PDNGW之间接口。现网中最常用的方式

 

S2b Itprovides the user plane with related control and mobility supportbetween ePDG and the Gateway.

非可信non-3GPPePDG3GPP网关PDNGW之间的接口

 

S2c  It provides the user plane with relatedcontrol and mobility support between UE andthe Gateway. This reference point is implemented overtrusted and/or untrusted non-3GPP Access and/or 3GPPaccess.

终端与3GPPSGW和PDG之间接口,S2c终端采用DSMIPv6协议,提供UEPDN GW之间的DSMIP隧道连接,这样UEEPC网络交互的数据可以实现透传,这是一种基于终端的切换,目前网络中基本不使用

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