IP-based Mobility Management for a Distributed Radio Access Network Architecture.

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1 IP-based Mobility Management for a Distributed Radio Access Network Architecture

2 Outline - Definition IP-based Mobility Management for a Distributed RAN Architecture Page 2 Siemens AG, H.Becker, 2003

3 Motivation - Definition IP based services shaping the future of cellular mobile IETF Protocols entering the mobile network architecture and concepts Networks using the IP layer as the common reference layer for multiple access technologies can be seen as ALL-IP Mobile Networks Terminal & User Mobility AAA/Security IP-based Mobile Network QoS / Traffic Engineering Integrated handling of of Mobility Management (MM), AAA and and QoS QoS is is required IP-based Mobility Management for a Distributed RAN Architecture Page 3 Siemens AG, H.Becker, 2003

4 IP impact on 3G network architecture E2E IP-based services "Internet" UTRAN UMTS packetoriented core network IMS IP transport IP transport and E2E IP based services can be introduced independently from each other IP-based Mobility Management for a Distributed RAN Architecture Page 4 Siemens AG, H.Becker, 2003

5 as a consequence for today s Two IP layers can be found in today s cellular mobile Example: UMTS Release 5 protocol stack IP adaptation (e.g. header compression) E2E IP Layer Application IP transport IP v4 or v6 IP v4 or v6 IP v4 or v6 Relay Relay PDCP PDCP GTP-U GTP-U GTP-U GTP-U RLC MAC L1 Uu RLC UDP/IP v4 or v6 MAC L2 L1 L1 UTRAN Iu- PS UDP/IP v4 or v6 L2 L1 3G-SGSN UDP/IP v4 or v6 L2 L1 Gn UDP/IP v4 or v6 L2 L1 L2 L1 3G-GGSN Gi GGSN GPRS GTP SGSN UDP Gateway GPRS Support General Packet Radio System GPRS tunneling protocol Serving GPRS Support User Datagram protocol IP-based Mobility Management for a Distributed RAN Architecture Page 5 Siemens AG, H.Becker, 2003

6 IP based RAN fundamentals IP based RAN = IP transport + mobile host proxy LTX Radio Base Station LTX IP based RAN (IPbRAN) User Plane Server IP-BS LTX Radio Control Server LTX AAA, QoS, MM enforcement point IP based Core Network Access Router IP network PLMN PSTN other IP network Open Architecture Characteristics + Separation of transport and Control (Flexibility/Scalability) + Open Interfaces + Multiple access technologies + CRRM + Migration based on existing terminals and re-use of networking equipment IP-based Mobility Management for a Distributed RAN Architecture Page 6 Siemens AG, H.Becker, 2003

7 Characteristics of the Proposed All-IP Architecture IP transport in Radio Access Network and Core Network Separation of Transport / User / Control Planes Distributed Control / User Plane Architecture Vertical integration of E2E IP and UTRAN Access Stratum is realized as MM enabled Access Router and User Plane Server (RAN) Open interfaces Standard transport and server platforms - UMTS Evolution - IP Impact - Example R 5 - Architecture - Characteristics Radio frames Mobile Host Proxy BTS BTS Soft Hand-over UPS (RNC) End Point of User individual IP Packets Access Router ( SGSN/ GGSN) IP-based Mobility Management for a Distributed RAN Architecture Page 7 Siemens AG, H.Becker, 2003

8 Principle network architecture functions control plane user plane Radio L1 BTS Cell Control Function Cell Bearer Gateway Radio Control Server Paging/ Broadcast Function User Radio Gateway User Plane Server Mobile Ctrl Function User or UE related functions µ Mobility Anchor Access Gateway CN - UMTS Evolution - IP Impact - Example R 5 - Architecture - Characteristics - Functions transport plane Routing/ Transport Function Radio Access Network Stratum Core Network Stratum IP-based Mobility Management for a Distributed RAN Architecture Page 8 Siemens AG, H.Becker, 2003

9 Outline Introduction IP IP-based Mobility Management for a Distributed RAN Architecture Page 9 Siemens AG, H.Becker, 2003

10 Usage of HMIPv6 Concepts exploit different grades of mobility by user and control plane separation BTS relocation UPS relocation RCS relocation Access Router relocation complexity frequency with RNC in contrast: U-plane mobility dictates frequency C-plane determines complexity BTS BTS radio layer mobility User Plane Server User Plane Server µ Mobility Anchor micro mobility Access Router macro mobility Access Router µ Mobility Anchor IP-based Mobility Management for a Distributed RAN Architecture Page 10 Siemens AG, H.Becker, 2003

11 User Radio Gateway relocation A virtual mobile host (VMH) is created for each terminal and allows the support of none mobile IP aware terminals for smooth migration The UPS assigns the mobile address to the VMH and register this as care of address (CoA) The transport IP tunnel packets are routed to the IPbRAN micro mobility home agent (µma) UE BTS URG UPS VMH MAF RCS Access Router - UMTS Evolution - IP Impact - Example R 5 - Architecture - Characteristics - Protocol Stack -VMH VMH BTS URG UPS IPbRAN µma UE BTS IP-based Mobility Management for a Distributed RAN Architecture Page 11 Siemens AG, H.Becker, 2003

12 Outline Introduction IP IP-based Mobility Management for a Distributed RAN Architecture Page 12 Siemens AG, H.Becker, 2003

13 3G RAN possible evolution All IP RAN Multi-radio Current UTRAN Monolithic RNC ATM transport IP transport Separation RCS/UPS IPbRAN RCS WLAN CRRM All-IP RAN RCS UPS UTRAN RNC UTRAN RNC UPS Step 3 Step 2 Today Step 1 IP transport option: IPv6 mandatory IPv4 possible Iu traffic moves closer to base stations User IP may be transported within RAN. Advance features of IPv6 may be used. IP-based Mobility Management for a Distributed RAN Architecture Page 13 Siemens AG, H.Becker, 2003

14 Summary and Outlook An All IP architecture for the future releases of mobile has been proposed, explaining how IP based mobility could work with existing cellular radio technologies (like W-CDMA) in the RAN A hierarchical Mobile IP based approach for mobility in distributed radio access has been discussed by using Mobile IP for macro and micro mobility functions. The concept has been proven by experimental systems enables separation of transport and control functions for a highly distributed RANs supports traditional none MIP aware terminals for smooth migration and supports multiple radio access technologies The All-IP vision might be achieved when the Virtual Mobile Host function coincides with the mobile host function on true IP aware mobile terminals IP-based Mobility Management for a Distributed RAN Architecture Page 14 Siemens AG, H.Becker, 2003

15 Thank you! Please do not hesitate to ask additional questions! SIEMENS Dipl.-Ing. Helmut Becker Director R&C Network Architectures and Protocols Siemens AG Information and Communication Mobile Networks ICM N PG SP RC NA D München Tel Fax IP-based Mobility Management for a Distributed RAN Architecture Page 15 Siemens AG, H.Becker, 2003

16 Outline Introduction IP Conclusions and IP-based Mobility Management for a Distributed RAN Architecture Page 16 Siemens AG, H.Becker, 2003

17 AAA Authentication, Authorization, Accounting AR Access Router BTS Base Station Transceiver CN Core Network CoA Care of Address E2E End-to-End GGSN Gateway GPRS Support Node GPRS General Packet Radio System GTP GPRS tunneling protocol HA Home Agent IETF Internet Engineering Task Force IMS IP Multimedia Subsystem IP Internet Protocol L2 Layer 2 MIP Mobile IP MM Mobility Management MN Mobile Node PS Packed Switched QoS Quality of service RAN Radio Access NetworkRTP Real Time Protocol RCS Radio Control Server SGSN Serving GPRS Support Node TCP Transport Control Protocol UDP User Datagram protocol UMTS Universal Mobile Telecommunication System UPS User Plane Server UTRAN UMTS Terrestrial Radio Access Network VMH Virtual Mobile Host IP-based Mobility Management for a Distributed RAN Architecture Page 17 Siemens AG, H.Becker, 2003

18 3GPP TS (2001). IP Multimedia Subsystem. 3rd Generation Partnership Project ( [2] 3GPP TS (2001). Architecture for an All-IP network. 3rd Generation Partnership Project ( [3] MWIF MTR007 (2001). Open RAN architecture in 3rd Generation Mobile Systems. [4] H. Becker, N. Gerlich: A functional architecture for 3G IPbased Radio Access Networks. IEEE 3G Wireless [5] M. Riegel, M. Tüxen (2002). Mobile SCTP. draft-riegeltuexen-mobile-sctp. (Work in progress). The Internet Engineering Task Force. [6] Rosenberg. J [ed] (2000). SIP: Session Initiation Protocol. RFC The Internet Engineering Task Force. [7] Perkins, C [ed]. (2001). IP mobility support. RFC The Internet Engineering Task Force. [8] Johnson, D. and C. Perkins (2001). Mobility Support in IPv6. draft-ietf-mobileip-ipv6-15 (Work in progress). The Internet Engineering Task Force. IP-based Mobility Management for a Distributed RAN Architecture Page 18 Siemens AG, H.Becker, 2003

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