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Combined GSM and MobileIP Handling in UMTS IP CN, phase 1 and 2 This WI will prepare a technical report studying the feasibility of evolving the GPRS backbone for UMTS to use more standard IP solutions. An initial assumption is a scenario with a combination of GSM/GPRS mobility management and Mobile IP . The output of this study will contain Identification of the requirements for supporting IP services and network interconnect in UMTS. A UMTS CN architecture based on components from GSM/GPRS as well as IP and Mobile IP (IPv4 and IPv6). A comparison of such an architecture with the current GPRS backbone architecture regarding performance, security, alignment with fixed IP networks and services etc. An analysis of the dependence of the development in IETF. A discussion on the compatibility with earlier phases of GPRS Justification The UMTS core network has been identified to evolve from the GSM core network. Further it is envisaged that the basis for mobility handling in a UMTS network will rely on the mobility services already provided by GSM2+ and on possible expansions of these. For providing IP services, an evolved GPRS architecture could be deployed. However, due to recent increased popularity in IP technology, there is some concern that the current GPRS structure might not be the optimal one for UMTS. Therefore it is of importance to study how UMTS could be better aligned with future development of IP networks, while reusing as much as possible of the already existing GSM infrastructure.. In order to provide roaming, and possibly handover, between radio access networks, the use of Mobile IP as a complement to GSM/GPRS mobility handling should be investigated. In a combination scenario, where an IP network is used in the core network, Mobile IP could be used to handle discrete mobility between access networks, i.e. roaming(and perhaps handover) between radio access networks (UTRANs), while GSM/GPRS could be used for handling subscriber data, charging mechanisms, security issues, etc., The GPRS SGSN node -enhanced with some IP functionality - could be used for mechanisms such as authorization and handling of encryption keys. This work item addresses a study on the enhancements needed to enable combined use of mobility handling systems, i.e. adoptions in terms of interfaces and functionality needed in the mobile terminal and in GSNs, as well as the combined use of home agents (HA) and HLRs. Service Aspects This work item aims at studying roaming, including handover, between UTRANs and to provide and facilitate direct Internet and intranet access from the mobile terminal. MMI-Aspects To be identified Charging Aspects The use of GPRS charging mechanisms in an IP environment will be addressed. Security Aspects . Security issues related to the use of IPsec will be included in the study.

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Edition: 3.0.0 Published: 08/01/2001 Number of Pages: 76