HTSG Requirements – Scope and Purpose September 2002 HTSG Requirements – Scope and Purpose Chris Ware, Sébastien Simoens, Amitava Ghosh, Karine Gosse Motorola chris.ware@motorola.com C. Ware, S. Simoens, A. Ghosh, K. Gosse, Motorola

September 2002 Background Market expectations exist for continual significant increase in WLAN speed and performance and thus renewed product success 802.11a represents a 1st generation solution for high data rate WLANs Legacy behavior will limit attainable performance Low power operation Capacity / peak throughput / range QoS Incremental enhancements to 802.11a/g will limit the capabilities improvement achieved, and may miss market requirements in the medium to long term Will also result in market fragmentation Only one option: Make Significant improvements through introduction of new, scalable technologies C. Ware, S. Simoens, A. Ghosh, K. Gosse, Motorola

September 2002 Drivers In order to ensure continuing WLAN market expansion and product life extension, the second generation standard needs to be carefully designed in terms of: Optimized cost / power / capacity / performance envelope Backward compatibility or coexistence with first generation systems Support of new applications as they emerge over time C. Ware, S. Simoens, A. Ghosh, K. Gosse, Motorola

September 2002 HTSG Proposed Purpose To define PHY and Medium Access Control protocol that can be gracefully deployed in the 5 GHz band and support: 100-200Mbps for raw peak user rate, together with higher effective cell throughput (70-140Mbps) low bit rate applications (increased voice capacity) flexible tradeoff between power, capacity and performance. Backward compatibility vs co-existence Proposed mechanism includes alternating TDMA and EDCF period. C. Ware, S. Simoens, A. Ghosh, K. Gosse, Motorola

HTSG Requirements Proposal (2/2) September 2002 HTSG Requirements Proposal (2/2) C. Ware, S. Simoens, A. Ghosh, K. Gosse, Motorola

HTSG Requirements Proposal (1/2) September 2002 HTSG Requirements Proposal (1/2) C. Ware, S. Simoens, A. Ghosh, K. Gosse, Motorola

HTSG Technical Avenues September 2002 HTSG Technical Avenues OFDM with higher number of sub-carriers and higher order QAM Space-time coding techniques e.g. 2 x 2 MIMO New channel coding techniques e.g. low constraint length turbo-codes, Hybrid ARQ Incremental Redundancy (IR) and Chase Combining MAC efficiency improvement e.g. TDD/TDMA incl. backward compatibility Reducing overhead in the MAC will only be part of the story Needs work. How much direct technology information do we include? How do we settle on numbers? Bear in mind that we want to drive new techniques here that push the time to market out beyond 3 years. C. Ware, S. Simoens, A. Ghosh, K. Gosse, Motorola

September 2002 Conclusion Imperative that we make big strides in developing the 802.11 standard Small incremental changes will have only limited improvements in capability New technology can allow a paradigm shift in applications C. Ware, S. Simoens, A. Ghosh, K. Gosse, Motorola