One Tunnel solution for Optimisation of Packet Data Traffic
The present document is a temporary container for a stage-2 like description of an architecture that uses direct tunnelling of user plane data between the RNC and the GGSN, which is known as One Tunnel approach. The content of this report when stable will be moved into 3GPP Technical Specification TS 23.060 [1].
This report will further develop the One Tunnel approach described in TR 23.873 [2] and identify what changes are needed to PS core and potentially to UTRAN functionalities and protocols to support the One Tunnel functionality. This include the investigation of the functions added after Rel‑4 up to Rel‑6 (e.g. Iu-flex, Network sharing, MBMS, etc) and either verify that they are not affected or address any conflicts between these functions and the One Tunnel function.
The resulting system architecture shall be fully interoperable with pre-Rel‑7 nodes and it should retain the existing network capabilities, or those that cannot be delivered need to be clearly documented.