4G & 5G Interfaces

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For studying main interfaces of 4G & 5G

Last updated 4:17 PM on 5/27/26
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11 Terms

1
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S1-U
Connects eNB to the Serving Gateway for user data transmission
2
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S1-MME
Connects 4G eNB to the MME for control signaling
3
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S11
Connects MME to the SGW for session management
4
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S6a
Connects MME to the HSS for user auth and subscription data
5
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N1
Carries NAS signaling between UE and AMF
6
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N2
Connects gNB and AMF for radio resource control
7
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N3
Connects gNB and the UPF for routing user data traffic
8
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N6
Connects 5G UPF to external data network (i.e. internet)
9
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N11
Connects AMF to SMF for session routing and policy enforcemnent
10
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N26
Connects 5G AMF to 4G MME to allow users to move between both
11
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S5/S8

Connects SGW to PGW for IP address allocation and routing