– S4: It provides related control and mobility support between GPRS core and the 3GPP anchor function of S-GW. In addition, if direct tunnel is not established, it provides the user plane tunneling. – S5: It provides user plane tunneling and tunnel management between S-GW and PDN GW. It is used for S-GW relocation due to UE mobility and if the S-GW needs to connect to a non-collocated PDN GW for the required PDN connectivity. – S6a: It enables transfer of subscription and authentication data for authenticating/authorizing user access to the evolved system (AAA interface) between MME and HSS.
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