SGW in 4G-LTE Telecom Network

SGW, refers to 'Serving Gateway'.
It is the first point in the 4G Core Network (EPC), that receives user plane data from the eNB. In turn, It serves as the mobility anchor point for user plane data, while the UE is moving between different eNBs.

The SGW connects between the eNB and the PGW.

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