OBAN Open Broadband Access Networks H. Almus, TU Berlin, EANTC Research The OBAN project is funded by the European Community’s Sixth Framework Programme, project partners and the Swiss Bundesamt für Bildung und Wissenschaft The information in this document is provided as is and no guarantee or warranty is given that the information is fit for any particular purpose. The user thereof uses the information at its sole risk and liability
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OBAN Open Broadband Access Networks H. Almus, TU Berlin, EANTC Research The OBAN project is funded by the European Community’s Sixth Framework Programme,
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OBAN Open Broadband Access
Networks
H. Almus, TU Berlin, EANTC Research
The OBAN project is funded by the European Community’s Sixth Framework Programme, project partners and the Swiss Bundesamt für Bildung und Wissenschaft
The information in this document is provided as is and no guarantee or warranty is given that the information is fit for any particular purpose. The user thereof usesthe information at its sole risk and liability
Use of capacities• Most private users are using the rented
bandwidth only for minor downloads– Usage heavily depends on the daytime
• Mostly used in the evening and on weekends• Minor usage during common working hours
• Rented bandwidth usually below technical available bandwidth– Caused by price policy of ISPs– Most often, the rented bandwidth is 1 or 2 Mbit/s (downlink)– On average, the installed broadband access
technology allows around 8 Mbit/s (downlink)– Estimated average use of a broadband access: ≤ 10
GByte per month• Only around 3-4 % of the rented bandwidth is actually
used • Regarding the technical available bandwidth at the access
• Today's mobile networks are evolving to broadband– Number of base stations and feeder lines will increase
dramatically– Next step from today's UMTS may require optical cables in the
feeder network– Granularity will become comparable to that of the fixed network
• The fixed network is continuously updated with advanced DSL technologies and optical cables– Most of the connected households and businesses will use
WLAN technologies for in-house networking
Extended use of WLANs as well as growing bandwidth demands will lead to a convergence of booth
• Simple bandwidth management– Home user retains the rented bandwidth and performance, independent from any
access and usage by visiting users• Conventional sharing concepts are based on a common use of the bandwidth rented
by the home user (Boingo, Linkspot etc.)– Use of additional available bandwidth for visiting users– Solution by adapted bandwidth management
• 2 data paths with fixed, well defined access rates
• Extended bandwidth management– Bandwidth actually not used by the home user will be available for visiting users
in addition to the extended bandwidth statically reserved for visiting users– Realization requires strict prioritization of the private users traffic in the limits of
the rented bandwidth
• The OBAN approach is a provider oriented solution – it requires the involvement of the access network provider!
– Solutions as offered by Boingo are just roaming agreements
• Knows the capacity of the access network– Traffic policing, priority queuing
• manages QoS-Profiles for each OBAN user– Integrated in the backend, could be integrated in AAA server
– Residential Gateway• Capacity Distribution Algorithm (CDA) defines, which capacity an
end system (terminal) gets assigned at a given time• Traffic policing / shaping, priority queuing to ensure proper use• Capacity tracking and adoption according to changing conditions
• OBAN has to support a secured data exchange in combination with a change of the used network without service interruption– OBAN project objectives include the support of interactive multimedia
services like videoconferencing and VoIP– OBAN tries to achieve handover times less than 120 ms (Layer 3)
• Typical handover times of 350 ms ore even higher (like 8-10 s in MIP environments) are not acceptable.
• Consequences: – The handover process including re-authentication has to take place
automatically - without any user interaction– The used Mobile IP solution has to be compatible with common
encryption techniques (VPN, IPSec and SSL)• Encryption must be setup as overlay on top of MIP, end points of encrypted
tunnels are terminated in MIP• OBAN terminals (notebooks, PDAs) have to support Mobile IP as
well as some OBAN specific extensions• OBAN users will have to install some OBAN specific software
Authentication• Full authentication (via AAA server) when changing AP / roaming is by far to
slow • Alternate solutions discussed within OBAN
1. Delayed Authentication1. Data traffic without previous authentication allowed for a limited time period2. Full authentication done immediately in parallel to initial use
2. Use of Kerberos Tickets1. Split of authentication process
1. Traditional full authentication via AAA server for the 1st access2. Specific authentication on shared secrets, partly shared in advance
3. Time-shifted computing1. Based on mutual authentication between terminal and Residential Gateway in conjunction
with a secured information and trusted points
• Solution 1– Delayed authentication may be forbidden by law
• at least in some European countries the ISP has explicitly inform the user about the approach and the risks regarding the initial data exchange
• Solution 2 and 3– Use of topographic knowledge required (neighborhood relations)
• Knowledge about reachable APs, additional information for re-authentication, Protocol extensions (801.X, EAP-xxx)
• Different portals for Visiting Users (VU) und Home Users (HU)– VU: location specific offers
Exact location of Residential Gateway is known!• Local events, special offers, …• Taxi stand next door, timetable of nearby located bus stops & undergrounds• Navigation: distance to events, friends, ….
– HU: may offer specific services to VUs• Garage sale today• Print Service (if HU is at home)
• SIP-UA: OBAN aware application– SIP based videoconferencing with automated adaptations
• Adopt codec used and image size in accordance with available QoS– Information provided by OBAN QoS broker