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

IP-based Mobility Management

for a Distributed Radio Access

Network Architecture

Outline

n

Motivation - Definition

n

Integration of IP in cellular radio networks

n

IP-based mobility management

n

Summary and outlook

Abbreviations

References

Ÿ Motivation

Ÿ Integration of IP

in cellular radio

networks

Ÿ IP-based mobility

management

Ÿ Summary and

outlook

Abbreviations

References

Motivation - Definition

n

IP based services shaping the future of cellular mobile

networks

n

IETF Protocols entering the mobile network architecture and

concepts

Ÿ Motivation

Ÿ

Integration of IP

in cellular radio

networks

Ÿ

IP-based mobility

management

Ÿ

Summary and

outlook

Abbreviations

References

Integrated handling of Mobility Management (MM),

AAA and QoS is required

Integrated handling of Mobility Management (MM),

AAA and QoS is required

n

Networks using the IP layer as the common reference

layer for multiple access technologies can be seen as

ALL-IP Mobile Networks

QoS /

Traffic Engineering

Terminal &

User Mobility

AAA/Security

IP-based Mobile

Network

QoS /

Traffic Engineering

Terminal &

User Mobility

AAA/Security

IP-based Mobile

Network

IP transport

E2E IP-based

services

UMTS

"Internet"

UTRAN

packet-oriented

core network

IMS

IP impact on 3G network architecture …

IP transport and E2E IP based services can be introduced

independently from each other

L1

RLC

MAC

L1

UDP/IP

v4 or v6

GTP-U

L2

Relay

L1

UDP/IP

v4 or v6

L2

GTP-U

IP

v4 or v6

3G-SGSN

UTRAN

Iu-PS

Uu

Gn

Gi

L1

RLC

PDCP

MAC

IP

v4 or v6

Application

3G-GGSN

UDP/IP

v4 or v6

GTP-U

L2

L1

UDP/IP

v4 or v6

GTP-U

L2

Relay

L1

L2

IP

v4 or v6

PDCP

L1

System

GTP GPRS tunneling protocol SGSN Serving GPRS Support UDP User Datagram protocol

E2E IP Layer

IP transport

IP adaptation

(e.g. header

compression)

… as a consequence for today’s networks

n

Two IP layers can be found in today’s cellular mobile networks

IP based RAN fundamentals

Open Architecture

IP transport

IP based RAN

=

+

IP based RAN (IPbRAN)

IP based Core Network

Access

Router

Radio

Control

Server

Radio

Base

Station

IP network

User

Plane

Server

…

IP-BS

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

AAA, QoS, MM

enforcement

point

Characteristics of the Proposed

All-IP Architecture

n

IP transport in Radio Access Network and Core Network

n

Separation of Transport / User / Control Planes

n

Distributed Control / User Plane Architecture

n

Vertical integration of E2E IP and UTRAN Access

Stratum is realized as MM enabled Access Router and

User Plane Server (RAN)

n

Open interfaces

n

Standard transport and server platforms

Ÿ

Motivation

Ÿ

Integration of IP

in cellular radio

networks

- UMTS Evolution

- IP Impact

- Example R’5

Ÿ IP-based mobility

management

- Architecture

- Characteristics

Ÿ

Summary and

outlook

Abbreviations

References

UPS

(RNC)

BTS

Access Router

( SGSN/ GGSN)

BTS

Radio frames

Soft Hand-over

End Point of

User individual

IP Packets

Mobile

Host

Proxy

Principle network architecture functions

µµµµ

Mobility

Anchor

co

nt

ro

l p

la

ne

us

er

p

la

ne

Paging/

Broadcast

Function

Mobile Ctrl

Function

Radio Control Server

BTS

tra

ns

po

rt

pl

an

e

_{Routing/ Transport}

Function

User Plane Server

Radio Access Network Stratum

Core Network Stratum

Cell Bearer

Gateway

User Radio

Gateway

Cell Control

Function

Radio L1

Access

Gateway

_CN

User or UE

related functions

Ÿ

Motivation

Ÿ

Integration of IP

in cellular radio

networks

- UMTS Evolution

- IP Impact

- Example R’5

Ÿ IP-based mobility

management

- Architecture

- Characteristics

- Functions

Ÿ

Summary and

outlook

Abbreviations

References

Outline

n

Introduction

n

IP in cellular radio networks

n

IP-based mobility management

n

Summary and outlook

Abbreviations

References

Ÿ

Motivation

Ÿ

Integration of IP

in cellular radio

networks

Ÿ IP-based mobility

management

Ÿ

Summary and

outlook

Abbreviations

References

µ

Mobility

Anchor

BTS

macro

mobility

micro

mobility

radio layer

mobility

BTS

µ

Mobility

Anchor

User

Plane

Server

User

Plane

Server

Access

Router

Access

Router

Usage of HMIPv6 Concepts

frequency

with RNC in contrast:

U-plane mobility dictates frequency

C-plane determines complexity

complexity

n

exploit different grades of mobility by user and control

plane separation

– BTS relocation

– UPS relocation

– RCS relocation

User Radio Gateway relocation

IPbRAN

UPS

UPS

RCS

Access Router

BTS

BTS

BTS

VMH

VMH

MAF

URG

URG

UE

UE

µµµµ

MA

n

A virtual mobile host (VMH) is created for each terminal and allows the

support of none mobile IP aware terminals for smooth migration

n

The UPS assigns the mobile address to the VMH and register this as

care of address (CoA)

n

The transport IP tunnel packets are routed to the IPbRAN micro

mobility management home agent (

µµµµ

MA)

Ÿ

Motivation

Ÿ

Integration of IP

in cellular radio

networks

- UMTS Evolution

- IP Impact

- Example R’5

Ÿ IP-based mobility

management

- Architecture

- Characteristics

- Protocol Stack

- VMH

Ÿ

Summary and

outlook

Abbreviations

References

Outline

n

Introduction

n

IP in cellular radio networks

n

IP-based mobility management

n

Summary and outlook

Abbreviations

References

Ÿ

Motivation

Ÿ

Integration of IP

in cellular radio

networks

Ÿ

IP-based mobility

management

Ÿ Summary and

outlook

Abbreviations

References

3G RAN possible evolution

Current UTRAN

• Monolithic RNC

• ATM transport

• IP transport

• Separation RCS/UPS

• All IP RAN

• Multi-radio

Today

Step 1

Step 2

Step 3

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.

Summary and Outlook

n

An All IP architecture for the future releases of mobile networks has

been proposed, explaining how IP based mobility could work

with existing cellular radio technologies (like W-CDMA) in the RAN

n

A hierarchical Mobile IP based approach for mobility management in

distributed radio access networks 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

n

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

Ÿ Motivation

Ÿ Integration of IP

in cellular radio

networks

Ÿ IP-based mobility

management

Ÿ Summary and

outlook

Abbreviations

References

Thank you!

SIEMENS

Please do not hesitate to

ask additional questions!

Please do not hesitate to

ask additional questions!

Outline

n

Introduction

n

IP in cellular radio networks

n

IP-based mobility management

n

Conclusions and outlook

Abbreviations

References

Ÿ Motivation

Ÿ Integration of IP

in cellular radio

networks

Ÿ IP-based mobility

management

Ÿ Summary and

outlook

Abbreviations

References

Abbreviations

n

AAA

Authentication, Authorization,

Accounting

n

AR

Access Router

n

BTS

Base Station Transceiver

n

CN

Core Network

n

CoA

Care of Address

n

E2E

End-to-End

n

GGSN

Gateway GPRS Support Node

n

GPRS

General Packet Radio System

n

GTP

GPRS tunneling protocol

n

HA

Home Agent

n

IETF

Internet Engineering Task Force

n

IMS

IP Multimedia Subsystem

n

IP

Internet Protocol

n

L2

Layer 2

n

MIP

Mobile IP

n

MM

Mobility Management

n

MN

Mobile Node

n

PS

Packed Switched

n

QoS

Quality of service

n

RAN

Radio Access NetworkRTP

Real Time Protocol

n

RCS

Radio Control Server

n

SGSN

Serving GPRS Support Node

n

TCP

Transport Control Protocol

n

UDP

User Datagram protocol

n

UMTS

Universal Mobile

Telecommunication System

n

UPS

User Plane Server

n

UTRAN

UMTS Terrestrial Radio

Access Network

n

VMH

Virtual Mobile Host

Ÿ Motivation

Ÿ Integration of IP

in cellular radio

networks

Ÿ IP-based mobility

management

Ÿ Summary and

outlook

Abbreviations

References

References

n

3GPP TS 23.228 (2001). IP Multimedia Subsystem. 3rd

Generation Partnership Project (www.3gpp.org)

n

[2] 3GPP TS 23.922 (2001). Architecture for an All-IP network.

3rd Generation Partnership Project

n

(www.3gpp.org)

n

[3] MWIF MTR007 (2001). Open RAN architecture in 3rd

Generation Mobile Systems.

n

[4] H. Becker, N. Gerlich: A functional architecture for 3G

IP-based Radio Access Networks. IEEE 3G Wireless 2001.

n

[5] M. Riegel, M. Tüxen (2002). Mobile SCTP.

draft-riegel-tuexen-mobile-sctp. (Work in progress). The Internet

Engineering Task Force.

n

[6] Rosenberg. J [ed] (2000). SIP: Session Initiation Protocol.

RFC 2543. The Internet Engineering Task Force.

n

[7] Perkins, C [ed]. (2001). IP mobility support. RFC 3220. The

Internet Engineering Task Force.

n

[8] Johnson, D. and C. Perkins (2001). Mobility Support in

IPv6. draft-ietf-mobileip-ipv6-15 (Work in progress). The

Internet Engineering Task Force.

Ÿ Motivation

Ÿ Integration of IP

in cellular radio

networks

Ÿ IP-based mobility

management

Ÿ Summary and

outlook

Abbreviations

References