1. Proposal for TGad Evaluation Methodology
April 2007
doc.: IEEE /0570r0
January 2009
Proposal for TGad Evaluation Methodology
Date:
Authors:
Eldad Perahia, Intel Corporation
Eldad Perahia, Intel Corporation

2. January 2009
Background
11n wanted to be sure that the technical solution satisfied typical usage models and objective comparison criteria
11n usage model document defined environments, applications, uses cases, usage models, all distilled into simulation scenarios
There were 9 environments, 21 applications, 39 use cases, 17 usage models, 11 simulation scenarios
Simulations were important in quantifying the amount of improvement of a feature
But in the end the task group focused on only three simulation scenarios
And it was necessary by those performing the simulations to modify the applications to saturate the system
11n comparison criteria document included many categories requiring extensive documentation by the proposal teams
Categories include marketability, backward compatibility and coexistence with legacy devices, performance measurements at the MAC SAP, MAC changes, PHY rates and preambles, channelization, spectral efficiency, PHY performance, PHY changes
In the end the task group focused mainly on throughput simulations
Physical layer impairments definitions were very useful in adding realism to PHY simulations
Eldad Perahia, Intel Corporation

3. Proposal for TGad Evaluation Methodology document
January 2009
Proposal for TGad Evaluation Methodology document
Combines the useful elements from both 11n usage models and comparison criteria documents
Defines conditions for functional requirements compliance
Limited set of simulations scenarios
Limited set of comparison criteria
Eldad Perahia, Intel Corporation

4. Conditions for Functional Requirement Compliance
January 2009
Conditions for Functional Requirement Compliance
Point-to-point link test
Source and sink
UDP traffic, with infinite offered load
select PHY channel model for each system performance functional requirement
Define link budget for range functional requirement
Tx power
Antenna gain
Path loss
Noise figure …
Eldad Perahia, Intel Corporation

5. PHY Simulation Conditions
January 2009
PHY Simulation Conditions
PHY channel impulse response model
Model for each simulation scenario environments
include antenna
Random orientation of antenna
PHY path loss model
Path loss model for LOS and NLOS
Differentiate between NLOS in a room/cubicle and between rooms/cubicles
Hardware impairments
phase noise
PA non-linearity
carrier frequency offset and symbol clock
Eldad Perahia, Intel Corporation

6. System Simulation Scenarios Evaluation
January 2009
System Simulation Scenarios Evaluation
Intent of the simulation scenarios is to quantify the benefit of new features introduced to the standard in typical usages
Minimize the simulation scenarios to those absolutely necessary to cover a diverse set of applications, environments, and channels
Minimize comparison criteria to quantitative metrics (e.g. throughput)
Simulation Scenario 1: Home living room
Application 1: Uncompressed video between set top box and TV
Simulation Scenario 2: Office conference room
Application 1: Laptop transmitting lightly compressed video to projector
Application 2: Laptops connected to AP for local file transfer and web browsing
Application 3: Mobile device connected to laptop for sync-and-go
Simulation Scenario 3: Enterprise cubicle
Multiple cubicles with devices operating on same channel
In each cubicle
Application 1: Laptop transmitting lightly compressed video to display
Application 2: Laptop connected to AP for local file transfer and web browsing
Application 3: Laptop connected to hard drive
Eldad Perahia, Intel Corporation