doc.:ieee 802.11 02/106 submission jamshid khun-jush, ericsson january, 2002 slide 1 integration of...
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Slide 1
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, Germanyjamshid.khun-jush@eed.ericsson.se
Slide 2
doc.:IEEE 802.11 02/106
Submission Jamshid Khun-Jush, Ericsson
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
Slide 3
doc.:IEEE 802.11 02/106
Submission Jamshid Khun-Jush, Ericsson
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
Slide 4
doc.:IEEE 802.11 02/106
Submission Jamshid Khun-Jush, Ericsson
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)
Slide 5
doc.:IEEE 802.11 02/106
Submission Jamshid Khun-Jush, Ericsson
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
Slide 6
doc.:IEEE 802.11 02/106
Submission Jamshid Khun-Jush, Ericsson
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
Slide 7
doc.:IEEE 802.11 02/106
Submission Jamshid Khun-Jush, Ericsson
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
Slide 8
doc.:IEEE 802.11 02/106
Submission Jamshid Khun-Jush, Ericsson
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
Slide 9
doc.:IEEE 802.11 02/106
Submission Jamshid Khun-Jush, Ericsson
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
Slide 10
doc.:IEEE 802.11 02/106
Submission Jamshid Khun-Jush, Ericsson
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
Slide 11
doc.:IEEE 802.11 02/106
Submission Jamshid Khun-Jush, Ericsson
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
Slide 12
doc.:IEEE 802.11 02/106
Submission Jamshid Khun-Jush, Ericsson
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.
Slide 13
doc.:IEEE 802.11 02/106
Submission Jamshid Khun-Jush, Ericsson
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
Slide 14
doc.:IEEE 802.11 02/106
Submission Jamshid Khun-Jush, Ericsson
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
Slide 15
doc.:IEEE 802.11 02/106
Submission Jamshid Khun-Jush, Ericsson
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
Slide 16
doc.:IEEE 802.11 02/106
Submission Jamshid Khun-Jush, Ericsson
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
Slide 17
doc.:IEEE 802.11 02/106
Submission Jamshid Khun-Jush, Ericsson
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
Slide 18
doc.:IEEE 802.11 02/106
Submission Jamshid Khun-Jush, Ericsson
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
Slide 19
doc.:IEEE 802.11 02/106
Submission Jamshid Khun-Jush, Ericsson
January, 2002
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