3GPP consists of three Technical Specifications Groups (TSGs) where TSG RAN (Radio Access Network) is responsible for the definition of functions, requirements, and interfaces of the Radio Access.
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TSG RAN consists of six working groups (WGs):
- RAN WG1, dealing with the physical layer specifications.
- RAN WG2, dealing with the layer 2 and layer 3 radio interface specifications.
- RAN WG3, deals with the fixed RAN interfaces—for example, interfaces between nodes in the RAN—but also the interface between the RAN and the core network.
- RAN WG4, deals with the radio frequency (RF) and radio resource management (RRM) performance requirements.
- RAN WG 5, dealing with device conformance testing.
- RAN WG6, dealing with the standardization of GSM/EDGE (previously in a separate TSG called GERAN) and HSPA (UTRAN).