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Reliable Wireless Systems: Connectivity Broker for Seamless Operation

This resource outlines the concept of a Connectivity Broker, providing a framework for absolutely reliable wireless systems. It addresses challenges such as interference, fading, and security while enabling seamless connectivity and collaboration among terminals. The architecture includes essential modules like Event Manager, Multi-Radio Resource Manager, and Security Manager. Various scenarios and case studies demonstrate the system's effectiveness, with a focus on managing network composition and optimizing resource allocation. The future work includes expanding to different wireless interfaces, enhancing QoS and security, and adopting distributed intelligence for improved performance.

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Reliable Wireless Systems: Connectivity Broker for Seamless Operation

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  1. CONNECTIVITY BROKERTowards Absolutely Reliable Wireless Systems (First Step) Alvaro Araujo Ali Ercan, Arash Parsa, Pavan Yedavalli, Jan Rabaey

  2. OUTLINE • Motivation • Challenges • Connectivity Broker • Architecture • Modules • Scenarios • TestBed • Future work

  3. MOTIVATION Jan Rabaey BWRC Summer Retreat 2008

  4. MOTIVATION How many cell phones do you have?

  5. MOTIVATION How many cell phones do you have?

  6. MOTIVATION How many laptops do you have?

  7. MOTIVATION Bluetooth?

  8. MOTIVATION 21! How many Access Points here?

  9. MOTIVATION Put all together…

  10. MOTIVATION …and moving

  11. MOTIVATION • How to make absolutely reliable wireless? • Challenges • Fading • Interference • Shadowing • Failures • Mobility: dynamic configuration • Different standards and protocols • Heterogeneous devices • Security

  12. MOTIVATION Connectivity Broker • How can this work? • Cognitive capabilities of terminals • Collaboration among terminals

  13. CONNECTIVITY BROKER Functional entity that can reside anywhere on the network Enables terminals to transparently connect to a backbone, network or each other Supports all modes of operation (managed / ad-hoc / p2p) and provides seamless migration from one to another

  14. CONNECTIVITY BROKER Supports weak and legacy terminals Provides the signaling necessary for control Adapts to future standards through programmability Optimizing utilization of the resources and/or cost, under policy rules, rules of engagement, security and quality constraints and resource constraints

  15. CB BLOCK • On all capable devices • Provides an abstraction layer for applications • Communication with others is through this block • Performs CB functions in collaboration with other nodes • Simple devices or legacy nodes might not have any CB block

  16. APPLICATION PRES Event Management Network Profiles Manager Connectivity Manager SESS Network Composition TRANSP NET Multi-Radio Resource Manager Security Manager MAC & LINK PHY CB ARCHITECTURE

  17. Event Manager • Manages ALL external events • Coordinate internal events • Event based tasks • Periodic tasks • Priorities • SendData & ReceiveData are external events

  18. Multi-Radio Resource Manager • Manage all radio resources • Carrier • Channel • Noise • Modulation • …

  19. Multi-Radio Resource Manager • Manage QoS requeriments • Throughput • Delay or latency • Delay jitter • Loss or error rate • Manage Flow & Mobility • Ensures connectivity • Mapping Bearers and flows • Base Station changes

  20. Bearer Manager • Manages all bearer resouces (PHY/MAC) • ESSID • freq/channel • sensitivity • tx power • link quality • noise level • new carrier • encryption

  21. Power Manager • Manages power capacities • Battery level • Consumption modes • Switch on/off modules

  22. Conectivity Manager • Initiates the establishment of connectivity between nodes • Manages CB communication • Interacts with all transport protocols • Old send and receive data • Manages name domain and address space

  23. Security Manager • Manages security mechanisms • Different security profiles • Different security levels • APP • NET • PHY • Manages keys encryption • Allocated dynamic profiles

  24. Network Composition Manager • CB brain OPTIMIZATION • Manages network composition • Interfaces • Modes • Reconfiguration • CB communication • Non-CB nodes communication • Centralized or distributed decision

  25. APPLICATION PRES Event Management Network Profiles Manager Connectivity Manager SESS Network Composition TRANSP NET Multi-Radio Resource Manager Security Manager MAC & LINK PHY CB ARCHITECTURE

  26. SCENARIOS • Emergency: Earthquake • Use different wireless communication • Efficient use: Football stadium • Increase spectrum owner $$$ • New user is happy • Secondary user: Eurocup in Yosemite • Increase spectrum owner $$$ • User is happy

  27. CASE STUDY I

  28. CASE STUDY I

  29. CASE STUDY II

  30. CASE STUDY II

  31. OUR TESTBED

  32. IMPLEMENTED • Power Manager, Bearer Manager, Event Manager, MRRM, CM, NCM, Security Manager • Interface: WIRELESS (802.11) • Optimization: Managed mode Ad-hoc • Devices: Lenovo Laptop, N800

  33. NEXT STEPS

  34. NEXT STEPS • Power Manager, Bearer Manager, Event Manager, MRRM, CM, NCM, Security Manager • Interface: WIRELESS (2 interfaces) & sensing node • Optimization: Routing/Cross layer • Improve discovery protocol • Different flows

  35. FUTURE • All modules • Interface: Wireless, Bluetooth, Zigbee, Wimax…(secondary user) • QoS • Security • Distributed intelligence • New hardware (USRP)

  36. QUESTIONS? ? Thanks! araujo@eecs.berkeley.edu araujo@die.upm.es

  37. Policy & Profile Registry • Policy & Profile “Data base” • Could be used for provided services company • Through Network Profiles Manager • Parameters • User • Primary • Secundary • Emergency • Rate • Max • Min • Price plan • Pre-paid, contract • …

  38. Properties Registry • Device properties “Data base” • All known/needed devices • Properties • Interfaces • Modes • Carrier • Rates • Memory • Power • Processing Capacity • …

  39. Network Profiles Manager • Manages Profile Networks • Radio resource permission • Who can do what (company?,state?) • Primary and secondary users • Emergency uses • Questions • Yes/No questions • QoS questions

  40. CHALLENGES Optimal utilization of the radio spectrum To make the communications cheaper Low power…

  41. CB ARCHITECTURE

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