Nowadays, 4G (fourth generation) mobile systems are widely used all over the world. There are different components in 4G technology such as:
• eNodeB
• MME
• P-GW
• S-GW
Role of eNodeB:
• The key role of eNodeB in 4G technology is to send the datagram’s between User Equipment (EU) and the Packet Data Network Gateway (P-GW) through the all-IP enhanced packet core.
• The UE datagram’s are encapsulated at the eNodeB and can be tunneled to the P-GW gateway. This tunneling may have Quality of Service (QoS) guarantees.
Role of MME:
• Mobility Management Entity (MME) is used to perform connection and mobility management on behalf of the User Equipments (UEs) resident on the cell.
• It also receives the UEs subscription information from Home Subscriber Servers (HSS).
Role of P-GW:
• The IP addresses for the UEs are allocated by the Packet Data Network Gateway (P-GW).
• It also performs the Quality of Service (QoS) enforcement.
• It also performs datagram encapsulation and decapsulation when the datagram’s are forwarding to or from the UEs.
Role of S-GW:
• Serving Gateway (S-GW) is said to be data-plane mobility anchor point because all the traffic of UEs are passed through S-GW.
• It can also perform billing function and lawful traffic interception.
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