CT3 was requested to provide an updated Terms of Reference (ToR) to the CT plenary in June 2005. Below is an updated ToR agreed at CT3#36, which is proposed to replace the current ToR ( NP-010222).
Link to terms of reference, updated at TSG#28 (doc CP-050030).
CT3 is responsible for:
Interworking
between a 3GPP PLMN and external nodes or networks.
Policy and charging control, end-to-end QoS mechanisms.
CT3 will address the following areas of work:
CS domain
Transport protocols from the core network towards the UE, incl. rate adaptation and RLP.
Data call signalling parameters from the core network towards the UE.
Control plane and user plane interworking towards the fixed network.
User plane protocols between MGWs (Nb interface).[e1]
PS domain and WLAN
Interworking between GPRS and external IP networks including enterprise. networks. Stage 2 and stage 3 responsibility for bearer level and AAA and DHCP functionality.
Interworking between WLAN and external IP networks, incl. bearer level and AAA functionality.
Providing presence information to the Presence Network Gateway from access network (e.g GPRS and WLAN) gateways.
Interworking between access network gateways and service networks/nodes, incl. MBMS Gmb interface
R reference point (TE – MT) related to the PDP context de/activation (scope of TS 27.060), incl. general requirements for AT commands
IM CN subsystem (IMS) of the PS domain
Interworking with CS networks
Interworking with external IP networks
Bearer related network entities, e.g. IM-MGW, TrGW
NGN related interworking impacts
Services
Circuit switched data services, incl. multimedia, facsimile and text telephony
Service Change and UDI Fallback (SCUDIF), stage 2
Policy and Charging Control, QoS
Service Based Local Policy within a PLMN and between a PLMN and external Application Functions
QoS mapping between service layer and access network bearer layer
End-to-end QoS mapping and negotiation
Usage of QoS protocols (such as DiffServ, RSVP and NSIS)
Provisioning of charging rules and charging policies at access network gateways