S4-SGSN in Mobile Network
S4-SGSN is an evolution of the SGSN (Serving GPRS Support Node) used in 3G networks. This evolution allows the SGSN to integrate with 4G-LTE nodes (the SGW and the PGW).
The S4 interface is the interface between the S4-SGSN and the SGW. It allows the SGSN to interact with the S-GW for the establishment, modification, and termination of user sessions.
The S4-SGSN is responsible for managing the user sessions, including the establishment, modification, and termination of data sessions. It works in conjunction with other network elements, such as the Serving Gateway (S-GW) and the Packet Data Network Gateway (P-GW), to control and maintain the user sessions.
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SGSN, GGSN – 2G/3G Network Architecture and Interfaces
2G/3G Network Nodes The following graph shows the 2G/3G Network Architecture. It includes the SGSN, GGSN, HLR, CG, PDN, RNC, and BSC. SGSN GGSN, HLR, CG, PDN, RNC, BSC, 2G/3G Network Interfaces Now we know the nodes that exist in the 2G/3G network. Let's learn the interface names that exist between those nodes. Every interface…
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What is PDP, and Attach in GPRS
What is PDP To know what is 'PDP', we should know that in order for an MS to be able to send and receive data to and from the PDN, The MS should create a data session between the MS and the GGSN. This data session is called the 'PDP context', which refers to 'Packet…
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What is an ‘EPS Bearer’ in LTE ?
During 'LTE attach' procedure, the network establishes this EPS Bearer between the UE and the PGW. The PGW assigns an IP address for this Bearer. The UE uses this IP address, in order to communicate with the PDN. In addition, the PGW assigns a QoS for this Bearer, which guarantees the QoS for the data…
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