Cisco Cisco ASR 5500
S3 Interface
This is the interface used by the MME to communicate with S4-SGSNs on the same Public PLMN for
interworking between GPRS/UMTS and LTE network access technologies. This interface serves as the
signaling path for establishing and maintaining subscriber UE contexts.
interworking between GPRS/UMTS and LTE network access technologies. This interface serves as the
signaling path for establishing and maintaining subscriber UE contexts.
The MME communicates with SGSNs on the PLMN using the GPRS Tunneling Protocol (GTP). The signaling
or control aspect of this protocol is referred to as the GTP Control Plane (GTPC) while the encapsulated user
data traffic is referred to as the GTP User Plane (GTPU).
or control aspect of this protocol is referred to as the GTP Control Plane (GTPC) while the encapsulated user
data traffic is referred to as the GTP User Plane (GTPU).
One or more S3 interfaces can be configured per system context.
Supported protocols:
• Transport Layer: UDP, TCP
• Tunneling: IPv4 or IPv6 GTPv2-C (signaling channel)
• Signaling Layer: UDP
• Network Layer: IPv4, IPv6
• Data Link Layer: ARP
• Physical Layer: Ethernet
S6a Interface
This is the interface used by the MME to communicate with the Home Subscriber Server (HSS). The HSS is
responsible for transfer of subscription and authentication data for authenticating/authorizing user access and
UE context authentication. The MME communicates with the HSSs on the PLMN using Diameter protocol.
responsible for transfer of subscription and authentication data for authenticating/authorizing user access and
UE context authentication. The MME communicates with the HSSs on the PLMN using Diameter protocol.
One or more S6a interfaces can be configured per system context.
Supported protocols:
MME Administration Guide, StarOS Release 19
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Mobility Management Entity Overview
MME in the E-UTRAN/EPC Network