From the course: 4G LTE: Architecture, Protocols, Call Flows, KPIs, Optimization, Performance Analysis

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SGW in LTE: Serving gateway explained

SGW in LTE: Serving gateway explained

From the course: 4G LTE: Architecture, Protocols, Call Flows, KPIs, Optimization, Performance Analysis

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SGW in LTE: Serving gateway explained

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While the MME is responsible for the control signaling part, the Serving Gateway, SGW, is the first major entity in the user plane, the part of the network that actually carries user data. For example, when you open a YouTube video or download an app, those packets don't just magically appear on your phone. The SGW is the first gate that receives them, routes them, and forwards them efficiently. SGW has different responsibilities. And primarily, it is focusing on the user plane. Now, SGW responsibilities kicks in after your session is authenticated and established by the MME. And it takes care of both handling, control, and user plane, and also taking care of the mobility. So MME, along with SGW, ensures that the mobility happens appropriately. So SGW acts as a mobility anchor during intra-LTE handovers. That is when you move from one eNodeB to another eNodeB. For example, you're walking from your office building to the parking lot while on a LTE call. Your device moves from one cell…

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