1. HTSG Requirements – Scope and Purpose
September 2002
HTSG Requirements – Scope and Purpose
Chris Ware, Sébastien Simoens,
Amitava Ghosh, Karine Gosse
Motorola
C. Ware, S. Simoens, A. Ghosh, K. Gosse, Motorola

2. 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 a/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

3. 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

4. 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:
Mbps 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

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

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

7. 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

8. September 2002
Conclusion
Imperative that we make big strides in developing the 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