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OBSS Strategies for 802.11aa

Compilation of ideas to address OBSS complexity in overlapping BSS environments without centralized management. Strategies include hybrid solutions, distributed approaches, and scalability considerations.

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OBSS Strategies for 802.11aa

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  1. OBSS Strategies for 802.11aa Authors*: Date: 2008-12-13 * This document is a compilation of ideas to solve the OBSS problem from TGaa members. Ganesh Venkatesan, Intel Corporation

  2. Abstract 802.11aa PAR includes the following: Increased robustness in overlapping BSS environments, without the requirement for a centralized management entity However, in the last three sessions we have listened to presentations that demonstrate the complexity of the general OBSS problem. This presentation is a collection of strategies to constrain the general OBSS problem to address the most common scenarios. Ganesh Venkatesan, Intel Corporation

  3. Options • Agree that OBSS is a complex problem and cannot be solved satisfactorily in TGaa and drop it from the PAR • Solve the problem for configurations that are manageable and back off to ‘legacy’ mode otherwise • Hybrid solution to solve the problem by invoking progressively complex mechanisms as the configuration grows in complexity • Add informative material describing policies, when co-operatively adopted, will minimize the occurrence of OBSS conditions Ganesh Venkatesan, Intel Corporation

  4. General Approachassuming option 2 (and option-3) from previous slide • Start with a distributed OBSS solution for a small network (e.g. doc 08/1260r1) • Define the scope/size of the network • Refine the solution to include all possible configurations (APs can hear each other directly, some APs cannot hear each other directly and not all APs use the same QoS mechanism) • Enhance the above solution with: • Mechanism(s) to monitor, detect and back off when the network configuration grows and the OBSS solution will fails to scale • Complement the distributed OBSS solution with a centralized management mechanism to scale the solution to a larger network Ganesh Venkatesan, Intel Corporation

  5. Issues • How does the distributed OBSS solution suffer from issues highlighted in 08/1250r0? • Is it possible to monitor and detect when the network configuration grows beyond the scope of the solution? • Is a centralized solution possible for all configurations? Who will be responsible for the centralized management? Would the centralized solution scale to solve the general OBSS problem? • The PAR scope explicitly limits solutions that include a centralized approach – does it call for a PAR amendment? Ganesh Venkatesan, Intel Corporation

  6. References • 08/1260r1 – Overlapping BSS Proposed Solution - OSQAP • 08/1250r0 -- My threshold for a satisfactory OBSS solution Ganesh Venkatesan, Intel Corporation

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