Arquitecturas de Redes
Integradas
Introducción
Ámbito
?Realizar trabajos de investigación
novedosos en aspectos relacionados
con las tecnologías de red de 4ª
Generación, incluyendo aspectos de
movilidad, soporte de calidad de
servicio, autenticación, autorización,
contabilidad, gestión de perfiles de
usuarios, así como la transición entre
redes 3G y 4G.
Introducción 2
1
1. Arquitectura 4G
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Arquitecturas de Red de 4G.
Integración de tecnologías de acceso heterogeneas.
Red de Acceso Radio basada en IP.
Transición e interoperación 3G-4G
2. Movilidad
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Trabajos de investigación relacionados con el soporte de mecanismos eficientes de
movilidad en redes 4G:
Movilidad en redes 4G
Interoperación con tecnologías de acceso heterogéneas
3. Calidad de Servicio
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Arquitecturas de red de soporte de QoS en 4G.
Adaptación de parámetros con tecnologías de acceso heterogéneas.
Armonización de mecanismos de QoS entre redes 3G y 4G.
Nuevos mecanismos de señalización para proporcionar QoS extremo a extremo.
4. AAAC
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Protocolos de transporte de AAAC
Interoperabilidad entre elementos de red basados en HLR/VLR y sistemas AAAC
Soporte de Modelos de Pago: post-pago, pre-pago
Soporte de mecanismos OSA en redes 4G.
Análisis de vulnerabilidades y estudio de mecanismos de segurida d.
5. Servicios
Introducción 3
Método
? Clases de seguimiento ~ mensuales.
? Presentación trabajo realizado y planificación a
futuro.
? Discusión de resultados, método, trabajos
relacionados.
? Generación de un artículo ~10 hojas y
presentación final.
? Plazo entrega 1 de Julio 2004
? Presentación semana 5-9 Julio 2004.
Introducción 4
2
Planificación
?Presentación: 9/12/03
?Presentación de trabajos: 9/01/2004
?Seguimiento: 13/02/2004
?Seguimiento:
?Seguimiento
?Seguimiento
?Entrega Artículo y Transparencias: 1 de
Julio de 2004
?Presentación Final: 5 de Julio de 2004
Introducción 5
Towards 4G – Facts and Assumptions
? Facts
? Millions of mobile devices/mobile users
“walking” around the world – changing IP addresses
? Always on paradigm of the Internet
? Assumptions:
? Roaming Agreements - different operators/technologies
? Each user has one contract
? IP convergence layer
? 4G network will be a commercial one
Introducción 6
3
Mobility Evolution
2G
3G
Release 5 and beyond
IPv6-based network with
mobility, QoS and AAA
IST Moby Dick
IPv6
IPv4
2000
2010
Introducción 7
Moby Dick Problem
Space
Auditing
Authentication
AAAC Authorisation
Accounting
Charging
Security
QoS
Differentiated Services
Signalling
L3 / L2 mapping
Policing
Handover
(seamless, fast)
Mobility Mobile IP
Paging
Context Transfer
Introducción 8
4
Moby Dick Mobility Issues
? Improve handover latency and data loss over standard MIPv6
? Latency of over 300 ms too high
? Make before break instead of break before make
? Integrate AAA and QoS
? Standard Mobile IP supports nomadic scenarios rather than seamless
mobility
? Candidates for implementation discussed within IETF:
? Fast Handover (FMIPv6)
? Hierarchical schemes, e.g. HMIPv6
? Simulations were done before a decision was taken in the project
Introducción 9
Moby Dick QoS Issues
? The provision of end-to-end QoS despite of Mobility and AAA
requirements taking care of:
? Scalability
? Performance
? Candidates as discussed in the IETF:
? Integrated Services (IntServ)
? Differentiated Services (DiffServ)
Moby Dick: Service oriented approach achieved by adoption of DiffServ
in combination with QoS Broker/AAAC
Introducción 10
5
Moby Dick AAA Issues
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Authentication – Proof of Users Identity
Authorisation – Management of Users permissions
Metering – Generation of raw usage data
Accounting – Provision/Post Processing of Metering data for Charging
Auditing – Proof of service provisioning
Charging – Calculating charges based on Accounting
Interaction with standard IP security (IPsec)
Moby Dick: AAAArch + Diameter enriched with IETF RTFM Meter,
Auditing and Charging - supporting seamless Mobility
Introducción 11
Moby Dick A PURE-IP 4G Architecture
Introducción 12
6
Moby Dick – Key Characteristics
? Use of UMTS-TDD spectrum
? IP directly on top of TD-CDMA
? Adapted Radio-dependent elements:
TD-CDMA interface and the radio link protocol
? All other network elements
(RNC, HLR, VLR, EIR, MSC, GMSC, SGSN, GGSN, …)
are replaced /redistributed by a functional IP-based equivalent
(Mobile IPv6, AAA Server, QoS Broker)
? Subset of 3GPP RRC protocol adapted to the Moby Dick IPv6
interface
Introducción 13
Moby Dick – Key Characteristics (2)
? IPv6-based solution for IP-Mobility across different technologies
? Heterogeneous access technologies
? TD-CDMA (base technology of UMTS TDD)
? Wireless LAN 802.11b
? Standard Ethernet
? Integration of mobility management including
? Handover and paging
? End-to-end QoS
? Authentication, Authorisation, Accounting, Auditing
and Charging
Introducción 14
7
Horizontal Integration
? Moby Dick integrates
? AAA
? QoS
? Mobility
? MAQ – Mobility - AAA – QoS
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Assign/configure CoA
Perform Authentication
Enable Authorization
Send BU /consume resources according to user profile
Accounting
Introducción 15
Vertical Integration
Mobile Terminal (MT), Access Router (AR), AAA Server, centralized profile
? MT: Handover decision/initiation (Mobility), Registration (AAA)
? AR: Mobility Management, context transfer
? Additionally:
• Radio Gateway: IP to TD-CDMA
• QoS Broker
• AAAC Server: Communication to QoS Broker during registration
? Centralized profile for “light-weight” signalling for probabilistic service
provisioning
Introducción 16
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User Mobility in Moby Dick
? Terminal Mobility in IP: user corresponds to IP Address
? Terminal Mobility in 2G: User corresponds to SIM card
? User Mobility in Moby Dick: User corresponds to User
having a user profile stored somewhere at the “home
network domain”
(AAA.h Server)
Introducción 17
User Profile
AAA.H
AAA.F
QoS B
User profile DB
AR
User Profile (AAAH)
Personal User data, Roaming permissions
NVUP
User
profile
subset 2
User Profile Subset 1 (AAAF)
Remaining Budget, Service specific permissions
NVUP (QoSB)
Technical Parameters
(Bandwidth…)
User Profile
Subset 2 (AR)
(Metering conf, IPsec)
Introducción 18
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Key Scenarios
? Registration
? MN is switched on
? MN firstly connects to any administrative domain
= > Mobility scenario across administrative domains is registration
? Session Setup
? Service Authorization
? Handover
? Intra-domain mobility scenario
Introducción 19
Summary
? Moby Dick integrated mobility, QoS, AAA based on existing standards
? Handover performance depends on scenario and additional factors –
Fast Handover improves performance for intra-domain scenarios
? Fast handover messages carry context information to allow immediate
authorisation
? The project has implemented IP paging
? Seamless integration of TD-CDMA to overall architecture
? Key achievement:
IP layer is able to handle seamless mobility, in a quality comparable to
2G, between technologies and supporting multimedia services
Introducción 20
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Moby Dick Impact
? Moby Dick is finishing in December 2003
? Room to improve
?techniques for QoS Management
?tighter integration of registration scenarios
?proper radio resource management
?Integration of OSS mechanisms in a commercialized mobile Internet
? Areas being explored commercially in the future…
?Operators: new management systems (QoS Brokers)
?Manufacturers: Overall System Concept as reference
?Academics: Daidalos Mobile University
Cheaper way for building “towards 4G” systems
Introducción 21
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