doc.:ieee 802.11 02/106 submission jamshid khun-jush, ericsson january, 2002 slide 1 integration of...

doc.:IEEE 802.11 02/106

Submission Jamshid Khun-Jush, Ericsson

January, 2002

Integration of WLAN and Wide Area Mobile Networks

Author:Jamshid Khun-Jush

Ericsson Research - Corporate Unit, [email protected]

doc.:IEEE 802.11 02/106


January, 2002

• Wireless Data Solutions

• WLAN Usage Scenarios

• Why WLAN - GPRS/3G Interworking

• Interworking Level/Architecture Options– Basics

– Pros & Cons

• Interworking Service Aspects and Security Challenges

• Standardization

Content

doc.:IEEE 802.11 02/106


January, 2002

Complementary Wireless “Data” Solutions

Mbps1 10 1000,1

Mo

bili

ty

WLAN

User Bitrates3

rd Generation

cellular

Bluetooth

Wide Area Mobile Network (WAMN)

Wireless Personal Area Network (WPAN)

Wireless Local Area Network (WLAN)2nd Generation Cellular

11bH2 /

11a / HiSWAN

doc.:IEEE 802.11 02/106


January, 2002

SGSN GGSN IWU

Enterprise

Wireless ISP

Home/SOHO

Mobile Operator

Ethernet

InternetW

LA

N

WLAN

WLAN

WLAN

Usage Scenarios

WL

AN

WLAN

WAMN

AP - AP Mobility (link level)

doc.:IEEE 802.11 02/106


January, 2002

Why WLAN – GPRS/3G interworking?

• Requirements:– needs for “global” roaming and mobility

– needs for high capacity - especially at hot spots

• Market:– Users of PC-type terminals as a part of the 3G operator

subscriber base

– 3G packet service expansion with small investment costs

– New services and applications

– Increased overall customer value Increased revenue stream

doc.:IEEE 802.11 02/106


January, 2002

Why Standardized Integration?

• More flexible and wider deployment

• Larger market for WLAN

• Exploiting world wide roaming infrastructure

• More advanced interworking solutions

• Support for cellular services on the WLAN segment

• Platform for new service concepts

doc.:IEEE 802.11 02/106


January, 2002

How a Single Global Interworking Standard?• WLAN – a family of technologies

– Interesting in an interworking perspective • IEEE 802.11• MMAC HiSWANa• HiperLAN2

• Challenge– A multiparty standardization issue

• Remedy– Collaboration on standard harmonization

• HiperLAN2- 3G Interworking spec. & HiSWANa network spec.– 3GPP feasibility study on a generic solution

• Generic solution – needs wider collaboration– HiperLAN2 – 3GPP has initiated a dialogue

– ETSI BRAN is in a position to play an important role• Number of collaboration points with all parties in discussion

doc.:IEEE 802.11 02/106


January, 2002

Interworking Level/Architecture

• Two basic approaches:– tight interworking (Iu-based)

– loose interworking (IP-based)

• Results in different characteristics and time lines, different pros & cons

• Both alternatives may lead to full support of all requirements in a long term

doc.:IEEE 802.11 02/106


January, 2002

Tight Interworking: Basic Architecture

SGSN: Serving GPRS Support NodeGGSN: Gateway GSN AAA: Authentication, Authorisation and Accounting

3GPPbasedCore

Network

IWU

WRAN

UTRAN

SGSN

HLR

AuCHSSGr

GGSN/FA

Signalling

ISP /Corporate /

ServiceNetwork

Gi

Gn

AP

RNC

AP

Node B

Signalling and User data

HA AAA

L2/ L3

Switch

BSGERAN

BSC

BS

Node B

Iu/ Gb

Iu

Roaming

partner

Iuhl2

HSS

doc.:IEEE 802.11 02/106


January, 2002

Tight Interworking: Features and Elements

IWU RNCIWU

GGSN

SGSN SGSNSGSN

APAP APAP

IuIuhl2Iurhl2/utrIurhl2

IubIubhl2Iubhl2

UuUuhl2

NodeB

NodeB

Dualmode

Mobile

• Iubhl2 interface for WRAN connection to the 3G core Network

– Iuhl2 very similar to Iu

– Iubhl2 and Uuhl2 are WLAN specific

– Iurhl2 can be WLAN specific

• Reuse of 3G mechanisms for mobility, QoS and security

• WLAN-3G interworking unit (IWU) needed

doc.:IEEE 802.11 02/106


January, 2002

Loose Interworking: Basic Architecture

3GPPbasedCore

Network

WSN/FA

WRAN

UTRAN

SGSN

HLR

AuC

AAA

HSS Gr

(Diameter) Wx

GGSN/FA

Signalling

ISP /Corporate/

ServiceNetwork

Gi

IP

Gn

AP

RNC

AP

BS

Node B

Signalling and User data

HA AAA

L2/ L3

Switch

GERAN

BSC

BS

Node B

Iu/Gb

Iu

AAA

Roamingpartner

doc.:IEEE 802.11 02/106


January, 2002

Loose Interworking: Features and Elements

AP

AP

The rest ofWLAN network

Router w/foreignagent

MTwith

(U)SIM

Gr

AAAL

GGSN w/foreignagent

SGSNRNCNode B

IP network

HLR

AAAH

HSS

Wx

• “The rest of WLAN network”

• IP router w/ foreign agent

• Wx is the interface between the WLAN Interworking architecture and 3G

• 3G integration by IETF protocols, e.g. Authentication by AAA protocols.

– Home AAA server (AAAH) is a part of the HSS

– Local AAA server (AAAL) is part of the WLAN interworking architecture.

• Different user identities linked by HSS

– unified treatment of a user wrt billing, service network functionality etc.

doc.:IEEE 802.11 02/106


January, 2002

Tight Interworking: Pros & Cons

Pros• Fully integrated mobility management

– high performance handover!

• Full service & thus QoS mapping possible

• Prospects for future development

• No need for additional AAA functionality

Cons• Will lead to a significant standardization effort!

• May take some time to be deployed

doc.:IEEE 802.11 02/106


January, 2002

Loose Interworking: Pros & Cons

Pros• Adapts well to IP protocol architecture

• Requires small standardization efforts in the short term

• Cost for deployment and maintenance

• Fast time to market

• Reduced business risk

Cons• Unclear service & QoS mapping

• Handover performance MAY BE unsatisfactory

Recommendation Go for Loose Interworking

doc.:IEEE 802.11 02/106


January, 2002

Service Aspects in an Interworking Context• Numerous additional service concepts

– A singular point of contact for the wireless user (administrational service gain)

– Easier and more efficient corporate access

– 3G services over WLAN access network e.g.• IP Multimedia Subsystem (IMS)

• Location Based Services (LBS )

• WLAN– A Pure data network

• Limitation of service offering?

• Fundamental for the realization of a solution within a reasonable time

– Voice service• Considered unimportant from the WLAN Side

doc.:IEEE 802.11 02/106


January, 2002

Interworking Scenario

• Voice service is a part of the interworking concept served by the public cellular access

WLAN Services

H2/11a/HiSWANa

3G Services (IMS.LBS..) Voice CS-services

3G

WLAN Services 3G Services (IMS.LBS..) Voice CS-services

3G

H2/11a/HiSWANaA micro cellular network under a 3G umbrella cell

doc.:IEEE 802.11 02/106


January, 2002

Security - Challenges

• Security must be preserved within the WLAN domain as it is in the 3G network– Both for User and for Network

• An obvious challenge for WLAN community– Level of protection differs in all WLAN systems

• Integrity

• Confidentiality

• Denial of service

• …

• Solutions for obtaining a secure authentication in an interworking scenario Robert`s presentation

doc.:IEEE 802.11 02/106


January, 2002

Standardization

• BRAN finalized and published H2-3G Interworking

requirements document

• Collaboration between BRAN and 3GPP underway

• 3GPP started a feasibility study on WLAN-UMTS interworking

– Objective: a generic solution for all WLAN standards

– Required: a wide collaboration amongst WLAN standards bodies

• BRAN and Japanese MMAC collaboration started

• BRAN seeks collaboration with IEEE802.11 on this issue

doc.:IEEE 802.11 02/106


January, 2002

doc.:ieee 802.11 02/106 submission jamshid khun-jush, ericsson january, 2002 slide 1 integration of...

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