The Project Co-ordination Group (PCG) is responsible for overall time-frame and management of technical work to ensure that the 3GPP specifications are produced in a timely manner as required by the market place according to the principles and rules contained in the Project reference documentation.
The TSG Service and System Aspects (TSG SA) is responsible for the overall architecture and service capabilities of systems based on 3GPP specifications. Among others :Definition and maintenance of the overall system architecture, definition of required bearers and services. Development of service capabilities and a service arquitecture. Charging, security and network management aspects
TSG SA WG1 Services works on the services and features for 3G. The group sets high level requirements for the overall system and provides this in a Stage 1 description in the form of specifications and reports. This work includes: Definition of service and feature requirements, Framework for services, Specification of services (stage 1), Specification of service capabilities (stage 1), Identification of technical and operational issues to meet market requirements and Charging and accounting requirements.
TSG SA WG2 Architecture is in charge of developing the Stage 2 of the 3GPP network. Based on the services requirements elaborated by SA1, SA2 identifies the main functions and entities of the network, how these entities are linked to each other and the information they exchange. The output of SA2 is used as input by the groups in charge of the definition of the precise format of messages in Stage 3 (Stage 2 for the Radio Access Network is under TSG RAN's responsibility). The group has a system-wide view, and decides on how new functions integrate with the exisiting network entities.
TSG SA WG3 Security is responsible for the security of the 3GPP system, performing analyses of potential security threats to the system, considering the new threats introduced by the IP based services and systems and setting the security requirements for the overall 3GPP system. SA WG3 aims at providing at least the same level of security and confidentiality as the 2nd Generation digital systems (e.g. GSM) and to improve upon this wherever feasible. SA WG3 continuously analyse the security implications of new services being developed..
TSG SA WG4 Codec deals with the specifications for speech, audio, video, and multimedia codecs, in both circuit-switched and packet-switched environments. Other topics within the mandate of SA WG4 are: quality evaluation, end-to-end performance, and interoperability aspects with existing mobile and fixed networks (from codec point of view).
TSG SA WG5 Telecom Management: The WG will specify the management framework and requirements for management of the 3G system, delivering the architecture descriptions of the telecommunication management network (TMN) and coordinating across TSGs all work pertinent to the 3G system telecom management.
The TSG Radio Access Network (TSG RAN) is responsible for the definition of the functions, requirements and interfaces of the UTRA network in its two modes, FDD & TDD. More precisely: radio performance, physical layer, layer 2 and layer 3 RR specification in UTRAN; specification of the access network interfaces (Iu, Iub and Iur); definition of the O&M requirements in UTRAN and conformance testing for Base Stations.
TSG RAN WG1 works on the physical layer of the radio Interface for UE and UTRAN. This includes the specification of the physical channel structures, the mapping of transport channels to physical channels, spreading, modulation, physical layer multiplexing, channel coding and error detection. The physical layer procedures and the measurements provided to upper layers are specified in WG1 as well.
TSG RAN WG2 is in charge of the Radio Interface architecture and protocols (MAC, RLC, PDCP), the specification of the Radio Resource Control protocol, the strategies of Radio Resource Management and the services provided by the physical layer to the upper layers.
TSG RAN WG3 is responsible for the Overall UTRAN architecture, and the specification of protocols in the Iu, Iur and Iub interfaces. The use of IP protocol for the transport layer in the UTRAN is studied in this group.
TSG RAN WG4 works on the RF aspects of UTRAN. RAN4 performs simulations of diverse RF system scenarios and derives the minimum requirements for transmission and reception parameters, and for channel demodulation. Once these requirements are set,the group defines the test procedures that will be used to verify them (only for BS). Requirements for other radio elements, like Repeaters, are specified in the RAN4 as well.
The TSG Core Network (TSG CN) is responsible for the specifications of the Core network part of 3GPP systems (which is an evolution from the GSM Core Network). More specifically: User Equipment - Core network layer 3 radio protocols ( Call Control, Session Management, Mobility Management), signalling between the core network nodes, interconnection with external networks, core network aspects of the Iu interface, O&M requirements and Packet related matters such as mapping of QoS
TSG CN WG1 defines the User Equipment - Core network L3 radio protocols (Call Control, Session Management, Mobility Management, SMS). CN1 addresses specifically SIP Call Control and SDP protocols for the IM subsystem.
TSG CN WG2 is responsible for the stage 2 and stage 3 specifications of the CAMEL feature (Customized Applications for Mobile network Enhanced Logic), this feature provides the mechanisms to support services consistently independently of the serving network. It shall facilitate service control of operator specific services external from the serving PLMN and help the operator to provide the subscribers with the operator specific services even when roaming outside the HPLMN.
TSG CN WG3 specifies the bearer capabilities for circuit and packet switched data services, and the necessary interworking functions towards both, the user equipment in the UMTS PLMN and the terminal equipment in the external network. In addition CN3 is responsible of end to end QoS for the UMTS core network in Release 5 and beyond.
TSG CN WG4 standardizes stage 2 aspects within the Core Network focusing on Supplementary Services, Basic Call Processing, Mobility Management within the Core Network, and Bearer Independent Architecture. CN4 also specifies the mobile specific protocol specifications within the mobile core network.
TSG CN WG5 is responsible for the stage 3 of the interfaces specific to the UMTS Open Service Access (OSA). CN5 develops Application Programming Interfaces (APIs) for the OSA, the UMTS network provides these interfaces to facilitate service implementations.
TSG Terminals (TSG T) is responsible for specifying terminal interfaces (logical and physical), terminal capabilities (such as execution environments) and terminal performance/testing.TSG T does not cover the radio aspects of terminals (see TSG-RAN) and nor does it cover speech/multimedia codecs (see SA4).
TSG T WG1 works on the specification of conformance testing at the Radio interface (Uu) for the User Equipment (UE). The test specifications are based on the requirements defined by other groups such as RAN WG4 for the radio test cases, and RAN WG2 and CN WG1 for the signalling and protocols test cases. T WG1 is organised in two subgroups, RF subgroup and signalling subgroup
TSG T WG2 is responsible for the Services and Capabilities to be delivered on 3GPP Terminal Equipment and ensuring that terminals meet the 3GPP objectives. In general, the group is responsible for Terminal-based Applications, Terminal Features and Terminal Interfaces.
TSG T WG3 is responsible for specifications involving the Subscriber Identity Module (SIM) which is used by 2G systems and the USIM (Universal Subscriber Identity Module) which is used by 3GPP systems; with the exception of the security algorithms (developed by SA WG3).
The TSG GSM/EDGE Radio Access Network (TSG GERAN) is responsible for the specification of the Radio Access part of GSM/EDGE. More specifically: RF layer, Layer 1, 2 and 3, internal (Abis, Ater) and external (A, Gb) interfaces, Conformance test specifications for all aspects of GERAN base stations and terminals and GERAN specific O&M specifications for the nodes in the GERAN.
TSG GERAN WG1 is responsible for the Radio Frequency aspects of GERAN, Radio Layer 1 specifications, Internal GERAN interface specifications such Ater (CCU-TRAU) and the specification of GERAN radio performance and Radio Frequency system aspects.
TSG GERAN WG2 is responsible for protocol aspects of GERAN. This is for layers above the physical layer, i.e. GERAN WG2 specifies the Data link and RLC/MAC layer protocols and the interfaces between these layers and the physical layer.
TSG GERAN WG3 develops the conformance test specification for GERAN base stations and works also on the O&M requirements and specifications for all GERAN nodes
TSG GERAN WG4 works on the conformance test specifications for testing of all aspects of GERAN terminals (radio and protocol aspects)