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3GPP Glossaries:  Interfaces / Reference Points

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|  S1‑MME  |  S1‑U  |  S2a  |  S2b  |  S2c  |  S3  |  S4  |  S5/S8  |  S6a  |  S6b  |  S6c  |  S6d  |  S6m  |  S6n  |  S6t  |  S7a  |  S7d  |  S8  |  S9  |  S9a  |  S10  |  S11  |  S11‑U  |  S12  |  S13  |  S13'  |  S14  |  S15  |  S16  |  S101  |  S102  |  S103  |  S121  |  SBc  |  Sd  |  SGd  |  SGi  |  SGi‑mb  |  SGmb  |  SGs  |  Sh  |  Si  |  SIP‑1  |  SIP‑2  |  SIP‑3  |  SLg  |  SLh  |  SLm  |  SLs  |  Sm  |  Sn  |  Sp  |  St  |  Sta  |  Sv  |  SWa  |  SWd  |  SWm  |  SWn  |  SWu  |  SWx  |  Sxa  |  Sxb  |  Sxc  |  Sy  |

 

S1-MME   (SCTP/S1AP)

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between  E-UTRAN
and  MME

see it   here

specified from  Rel-8  in
TS 23.401, clause 5.1.1.2
TS 36.411
.412
.413 

S1-MME is the reference point for the control plane protocol between E-UTRAN and MME.


S1-U   (GTPv1-U)

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between  E-UTRAN
and  S-GW

see it   here

specified from  Rel-8  in
TS 23.401, clause 5.1.2.2
TS 36.411
.414
TS 29.281 

S1-U is the reference point between E-UTRAN and S-GW for the per-bearer user plane tunnelling.


S2a

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see it   here

specified from  Rel-8  in
TS 23.402, clause 6
clause 16
TS 29.274
.275
.279
.281
TS 24.304 

The following protocols are supported on S2a:
  • PMIPv6
  • MIPv4 FA mode
  • GTP based protocol for Trusted WLAN


S2b

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between  PDN-GW / S-GW
and  ePDG

see it   here

specified from  Rel-8  in
TS 23.402, clause 7
TS 29.274
.275
.281 

The following protocols are supported on S2a:
  • PMIPv6
  • GTP


S2c

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between  PDN-GW
and  UE

see it   here

specified from  Rel-8  in
TS 23.402, clause 15
TS 24.303 

This interface provides the user plane with related control and mobility support. It is implemented over trusted and/or untrusted non-3GPP Access and/or 3GPP access.



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