open access networks interworking2002, perth, australia october 13-16, 2002 presented by: einar...
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Open Access Networks
Interworking’2002, Perth, AustraliaOctober 13-16, 2002
Presented by:Einar Edvardsen,Telenor R & D, Norway
Teleph: +47 915 29029E-mail: einar-paul.edvardsen@telenor.com
Authors:Einar Edvardsen (Telenor)Thor G Eskedahl (Telenor)André Årdal (Telenor)
13-16. October, 2002 Slide 2Interworking'2002 Perth, Australia
Wireless broadband –requirements to the core networkCoverage of various mobile systems GSM (14 kb/s) covers 10 km2 (r < 4 km) UMTS 1(< 384 kb/s) covers 1 km2 (r < 1
km) UMTS 2(< 2 Mb/s) covers 0,1 km2
4G (< 20 Mb/s) covers 0,01 km2 (r < 100 m)
3G/4G mobile systems require huge fixed core network infrastructures
Each base station requires a broadband feeder – an optical fibre.
Generally – only copper cables exist in access network and a new infrastructure will therefore have to be installed
GSMUMTS
1 4G
No of base stations
>100 000(Norway)
2
13-16. October, 2002 Slide 3Interworking'2002 Perth, Australia
The fixed network’s broadband offering is evolving In spite of the resession in telecom, the number
of broadband customers is rapidly increasing Millions of ADSL modems are being installed Millions of Cable Modems are being installed After ADSL – then VDSL – then fibres
Broadband capacity will be distributedall over the populated areas- wasted capacity most of the time
13-16. October, 2002 Slide 4Interworking'2002 Perth, Australia
The Open Access Network
Access line to broadband network
MBS
13-16. October, 2002 Slide 5Interworking'2002 Perth, Australia
A user scenario
Operator 1Cable modem
Operator 2LMDS
Operator 4VDSL
Operator 3ADSL
13-16. October, 2002 Slide 6Interworking'2002 Perth, Australia
Traditional way of establishing the feeder network for a 4G mobile broadband House/customer
StreetBase station
New fiber cable
13-16. October, 2002 Slide 7Interworking'2002 Perth, Australia
The Open Access Network architecture
House/customerStreetBroadband customer with OAN gateway
13-16. October, 2002 Slide 8Interworking'2002 Perth, Australia
Bandwidth considerations
Bandwidth of wLAN: 25-30 Mb/s (30 m)– Bandwidth decreases as traffic and number of users
increases– Bandwidth decreases as distance to MBS increases
Bandwidth of access lines– Unsubscribed available bandwidth
• The difference between the technical realisable bandwidth and the user’s subscription
• 0,4/5 Mb/s (ADSL) and 2/10 Mb/s (VDSL) ?– Unused instantaneous bandwidth
• The unused part of the subscribed bandwidth• A variable bandwidth max. equal to the subscription rate
– Priority enforced bandwidth• Bandwidth, which may be available if the visiting user is
allowed to overrule the fixed subscriber.• Equal to the overruled service/application
13-16. October, 2002 Slide 9Interworking'2002 Perth, Australia
Potential coverage
Assumed that standard wLAN technology is used
Covers potentially 100 % of urban area(Norway: 75% (3 mill) of population, 0,7% of area)
Spotwise coverage for the rest, 5% of area
Required number of MBSs:Urban area: 25 000 – 1000 000 MBSesSub-urban area: ~ 250 000
13-16. October, 2002 Slide 10Interworking'2002 Perth, Australia
The concept contains numerous challenges
How to match QoS in the legacy network with what can be achieved in a wireless LAN and while traversing from MBS to MBS ?
Mobility aspects – nomadic or continuous mobility
Security and authentication Roaming agreements between
– different network operators – owners of MBSs How to deal with the large variety of terminals
? Interference between MBSs and with other
equipment – frequency planning Business models and commercial aspects
13-16. October, 2002 Slide 11Interworking'2002 Perth, Australia
Ownership to Micro Base Stations Owned by subscribers
– Roaming agreements, – Compensation– Maintenance– Security/access control/authentication issues
Owned by operators– The MBS becomes a network component equal to others– Compensation – Maintenance by the operator– Security/access control/authentication – Physical access to the equipment
Operators may choose different business models– 30 operators in Norway – 30 different tariffing models?
13-16. October, 2002 Slide 12Interworking'2002 Perth, Australia
Business models and commercial aspects – other aspectsFixed network operators
– New service in the network – new business opportunities– Increased traffic– Draining P2P/Ad-Hoc traffic into their network – Stretching the operator influence into home networking– Wireless broadband to stationary and mobile users
simultaneously– Home networking – a new business opportunity
Service providers– OAN is a new business area complementary to GSM,
GPRS, UMTS– Home networks, also a new business area
Stationary users– Cheap wireless home networking provided by
operators/service providers– Boarderless Home networks Universal Mobility
13-16. October, 2002 Slide 13Interworking'2002 Perth, Australia
Conclusions
The Open Access Network architecture is an innovative approach to upgrading the existing public broadband access network to support broadband mobile services.
Only the idea is presented How to realise it is a quite another issue to
solve !
13-16. October, 2002 Slide 14Interworking'2002 Perth, Australia
Guaranteed Quality of service in OANs ?
QoS protocols of IP is important, but is it enough?– RSVP, DiffServ, MPLS, IP o/ATM, ….
QoS in wireless LANs– HiperLAN/2 has QoS – WLAN IEEE 802.11e– HomeRF
How to guarantee QoS while roaming ?
13-16. October, 2002 Slide 15Interworking'2002 Perth, Australia
Mobility aspects
Traversing local premises – P2P/Ad-Hoc communication
Traversing from MBS to MBS (controlled by one operator)
– Mobility and hand-over protocols Traversing from MBS to MBS (controlled by different
operators)
– Mobility and hand-over protocols– Protocols for roaming– Protocols for charging and QoS dependent roaming
13-16. October, 2002 Slide 16Interworking'2002 Perth, Australia
Security and authentication
Security and authentication are fundamental for the OAN concept
System security schemes should provide firewalls and intrusion detection systems
Existing standards for communication security– VPN
• encryption, authentication – suitable for sections between MBSs and on the access line, but do not provide end-to-end security
• Processing intensive – not usable for seamless mobility and prohibit RT-pplications
• IPSEC wrapped around Mobile IP to solve the processing problem, but does not perform well enough
– SSH-TRANS/CONN… and SSL/TLS for secure access– Wireless encryption standardised by IEEE802.11– Object Security based upon PKI (protects data objects)
How do the protocols perform under mobile conditions ?
13-16. October, 2002 Slide 17Interworking'2002 Perth, Australia
The variety of terminals
MBS
HiperLAN
?
WLAN 802.11y
Bluetooth
WLAN 802.11x
P2P/Ad-Hoc example
13-16. October, 2002 Slide 18Interworking'2002 Perth, Australia
Interference
Large scale deployment of wireless LANs challenges the technology– WLAN (a,b,c,d,e,f,……), HiperLAN/2, Bluetooth,
UWB ?– Does any of these comply with the requirements ?
Overlapping LANs - same or different standard (WLAN, HiperLAN, Bluetooth, UWB,…)
Interference with other equipment
13-16. October, 2002 Slide 19Interworking'2002 Perth, Australia
Thank you for
listening
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