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MaGMA: Supporting Groupware in Wireless Networks

MaGMA: Supporting Groupware in Wireless Networks. Idit Keidar Technion EE. Joint work with N. Lavi and I. Cidon. Agenda. Motivation Solutions known to date Our proposed architecture Group management solutions Simulation and analysis Future work Conclusions. Current Application Trends.

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MaGMA: Supporting Groupware in Wireless Networks

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  1. MaGMA: Supporting Groupware in Wireless Networks Idit Keidar Technion EE Joint work with N. Lavi and I. Cidon

  2. Agenda • Motivation • Solutions known to date • Our proposed architecture • Group management solutions • Simulation and analysis • Future work • Conclusions

  3. Current Application Trends • Groupware and collaborative applications are widely used. • Chat, Instant-Messaging, VoIP, VCoIP, Net-meeting • Exchange, Lotus notes, webex • Multiplayer interactive games • Push-to-talk (PTT)

  4. Current Cellular Trends • Simple groupware such as Instant Messaging widely used • Major cellular providers (Orange, Verizon, Nextel) offer PTT services • The Yankee Group (Sep. 2003): • In 2003, $84 million PTT revenue, 2.3 million PTT subscribers • By 2008, $10.1 billion PTT revenue, 340 million PTT subscribers

  5. Future Cellular Trends • Richer groupware applications • Data+ voice+ video • Adopting TCP/IP infrastructure • Session Initiation Protocol (SIP) signaling • OMA, 3GPP, 3GPP2 standards

  6. Wireless Networks Trends • Maturing standards (Wi-Fi, WiMAX) • High availability of hot spots • Supported in PDAs, Pocket PCs, laptops, and cellular-phones • Emerging standards and working groups: IETF-MIP, Open Mobile Alliance, 4G

  7. Mobile Networks Trend Groupware popularity Wireless access availability Cellular going IP + + B3G Convergence

  8. The Future Network • IP based

  9. The Challenges Supporting groupware! Where is the group’s home? Supporting Mobility! Where is the MN? Supporting RT services!

  10. Mobile Groupware Design Goals • Mapping group names to subscribers • Mobility support • Seamless handoff • QoS support for RT applications • Transport efficiency • Transport reliability • Roaming, AAA • Scalable • Support for incremental deployment

  11. Solution Known to Date • Mobility solutions: MIP+route optimization, SIP mobility • Not for groupware! • Based on home per address • The group needs a home too • Groupware solutions • Not for mobility • Mostly based on single server Why?

  12. Our Solution Transport Efficiency Mobility Support Mobility and Group Management Architecture Group Management

  13. MaGMA’s Architecture • Servers: Mobile Group Managers (MGMs) as part of the infrastructure • Clients: Mobile Nodes (MNs), served by local MGMs Hello! new address

  14. MaGMA’s Architecture (cont.) Group Blue Group Red Domain-4

  15. MaGMA’s Key Advantages • Distributed architecture • No bottlenecks, no triangle routing, no SPoF • Eliminates the “home” concept, for both mobility and group support • Incorporates smooth handoff • Supports RT groupware • Various group management solutions optimized for different settings • e.g., subscription versus overlay model

  16. Group Management Approach I • Subscription model • Good for lightweight servers, small groups Group-X MN1 MN2 MN3 Group-X MN1 MN2 MN3 Group-X MN1 MN2 MN3 join leave forward local events move ret./subsc. view

  17. Group Management Approach II • Multicast overlay model • Scalable in group size, good for low battery clients localView MN1 groupView MGM1 groupView MGM2 localView MN2 MN3 join leave join/leave/handoff move data

  18. Further Enhancements: MaGMA Overlay • MGMs organized in overlay • Multicast data forwarded over the overlay

  19. Router Router MGM MGM MaGMA’s Implementation Core Network Access Networks SOHO Networks Controller DHCP Root Router Router PSTN Switch Controller MGM

  20. Simulation & Analysis: Subscriber vs. McastOverlay Control Overhead Evaluation

  21. Simulation: MaGMA vs. MIP Transport Delay MGM1 functions as the HA

  22. Simulation: MaGMA vs. MIP Packet Loss During Movement • Link BW: 5mbps • Link delay: 40ms • MGM1 functions as HA • CBR, 20 bytes, 100pkts/sec • MIP’s update delay: depends on distance from HA MaGMA’s update delay: (1) depends on distance between MGMs  (2) When moving into active domain: wireless handoff time

  23. Data Packet - Header Overhead IP IP IP group IP IP IP IP IP IP UDP UDP UDP UDP UDP UDP Unicast Multicast

  24. MaGMA Prototype db Group App. MaGMA Parser NIST-SIP Group App. MaGMA Engine Microsoft-SIP * Based on Microsoft RTC client

  25. Future Work • Application services • application server session migration • floor-control • AAA • MGM failures and dynamic changes • Hybrid networks: ad-hoc and access point

  26. Conclusions • Wireless networks (Wi-Fi, WiMAX) will merge with the Internet and cellular infrastructure • Users will demand support for groupware such as PTT • Current IP mobility solutions - inadequate for RT • Our solution provides comprehensive support for group management and RT applications

  27. More Information… • N. Lavi, I. Cidon and I. Keidar:“Supporting Groupware in Mobile Networks”6th IFIP IEEE International Conference MWCN, Oct. 2004. • N. Lavi, I. Cidon and I. Keidar:“MaGMA: Mobility and Group Management Architecture for Real-Time Collaborative Applications in Converged Wireless Networks”To appear in WCMC Journal, Wiley. • http://comnet.technion.ac.il/magma

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