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3GPP (3rd Generation Partnership Project)
organizational structure

each Technical Body ( TSG: Technical Specification Group, and  WG: Working Group)
has a link to dedicated page

TSG SA

WG SA1

WG SA2

WG SA3

WG SA4

WG SA5

WG SA6

TSG CT

WG CT1

WG CT3

WG CT4

WG CT6

TSG RAN

WG RAN1

WG RAN2

WG RAN3

WG RAN4

WG RAN5

WG RAN6