4g Lte Evolved Packet Core Epc Concepts And Call Flows Download Hot !exclusive! Guide

+---------------------------------------------+ | HSS (Database) | +----------------------+----------------------+ | | S6a (Diameter) | +------+ S1-MME +------+------+ S11 +--------+ | eNB |-------------->| MME |------------>| S-GW | | (4G | (NAS/S1AP) +-------------+ +---+----+ | Base | | | Stn) |-----------------------------------------------+ S5/S8 | | S1-U (GTP-U) | +------+ +---+----+ +-----------+ | P-GW |------| PDN / IP | +---+----+ SGi | Internet | | +-----------+ | Gx +---+----+ | PCRF | +--------+ 1. Mobility Management Entity (MME)

The source eNodeB determines a handover is needed based on signal strength and sends a request to the MME. This commands the tower to build a secure

The MME validates the request and issues an S1-AP Initial Context Setup Request to the eNodeB. This commands the tower to build a secure radio bearer for data transmission. Packet Data Network Gateway (P-GW)

The S-GW manages the user plane traffic, routing incoming and outgoing data packets. It acts as the local mobility anchor for data when a user moves between different eNodeBs (4G cell towers). Packet Data Network Gateway (P-GW) This commands the tower to build a secure