June 2008
IEEE P802.19-08/0018r1
IEEE P802.19
Wireless Coexistence
Project
IEEE P802.19 Coexistence TAG
Title
40MHz 802.11n Bluetooth Simulation Parameters
Date
Submitted
[June 18, 2008]
Source
[Stephen J. Shellhammer]
[Qualcomm, Inc.]
[5775 Morehouse Drive]
[San Diego, CA 92121]
Voice:
Fax:
E-mail:
[(858) 658-1874]
[(858) 651-3004]
[shellhammer@ieee.org]
[Vinko Erceg]
[Broadcom Corporation]
[16340 W Bernardo Dr]
[San Diego, CA 92127]
Voice:
E-mail:
[(858) 521-5885]
[verceg@broadcom.com]
Re:
[]
Abstract
[]
Purpose
[]
Notice
This document has been prepared to assist the IEEE P802.19. It is offered as a
basis for discussion and is not binding on the contributing individual(s) or
organization(s). The material in this document is subject to change in form and
content after further study. The contributor(s) reserve(s) the right to add, amend or
withdraw material contained herein.
Release
The contributor acknowledges and accepts that this contribution becomes the
property of IEEE and may be made publicly available by P802.19.
Submission
Page 1
Steve Shellhammer, Qualcomm, Inc.
June 2008
IEEE P802.19-08/0018r1
1 Background
This document summarizes the Simulation Parameters for evaluating the impact of IEEE
802.11n 40MHz channel use in the 2.4 GHz band on a neighboring Bluetooth connection.
The simulation is intended to be simple in order to obtain results in a timely manner.
2 Simulation Overview
This simulation consists of two networks: 802.11n and Bluetooth. For Bluetooth the two stations
consist of a Master and a Slave. In the case of 802.11n there are two scenarios:


An Access Point and a client station (20 MHz and 40 MHz operation). This may be a
typical home scenario.
Two Access Point/client station pairs operating on different channels (20 MHz operation
only). This may be a typical open floor enterprise scenario.
3 Simulation Geometries

The two Bluetooth devices are each in the 1-10 meter range from the 802.11n client. The
two Bluetooth devices are separated by 1 meter distance. The simulation will assume free
space path loss for the link between the 802.11n client and each of the two Bluetooth
devices and also between the two Bluetooth devices. The 802.11n Access Point is
assumed to be far enough from the Bluetooth devices such that it does not cause
significant interference to the Bluetooth devices. So the 802.11n interference is caused
by the 802.11n client station.

The two Bluetooth devices are each in the 1-10 meter range from the two 802.11n clients.
The two Bluetooth devices are separated by 1 meter distance. The simulation will assume
free space path loss for the link between each 802.11n client and each of the two
Bluetooth devices and also between the two Bluetooth devices. One of the two 802.11n
clients has 6 dB additional path loss (to account for more probable scenario of different
distances between the Bluetooth devices and each of the 802.11n clients). The 802.11n
Access Points are assumed to be far enough from the Bluetooth devices such that they do
not cause significant interference to the Bluetooth devices. So the 802.11n interference is
caused by the 802.11n client stations.
Submission
Page 2
Steve Shellhammer, Qualcomm, Inc.
June 2008
IEEE P802.19-08/0018r1
4 Power Levels
The 802.11n client station will transmit 15 dBm EIRP. The Bluetooth Master device will
transmit 4 dBm EIRP (Class 2).
5 Traffic Model
The 802.11n traffic model is a file transfer from the 802.11n client to the 802.11n Access Point.
This represents a worst case condition in which the 802.11n client is transmitting at a high duty
cycle. Other traffic models could be included later.
The Bluetooth devices will be transmitting enhanced SCO (eSCO) traffic which is representative
of typical voice traffic between a cell phone and a Bluetooth headset. Additionally standard
SCO will also be modeled, since not all headsets are capable of eSCO operation.
6 802.11n Bandwidth
Three simulations shall be included for comparison purposes. In the first simulation the 802.11n
AP/client pair will be operating in 20-MHz mode. In the second simulation the 802.11n
AP/client pair will be operating in 40-MHz mode. In the third simulation two 802.11n AP/client
pairs will be operating in 20-MHz mode. The simulations will allow a comparison of the effects
of the different channel bandwidths on the Bluetooth network.
7 802.11n Operating channels


One Access Point/client station pair case (20 MHz and 40 MHz operation): channel 6
Two Access Point/client station pairs case (20 MHz operation only): channel 1 and 6
8 Bluetooth Adaptive Frequency Hopping
The simulation assumes that AHF is disabled. In the future if a representative AFH algorithm
can be obtained, simulations with AFH enabled could also be included.
9 Coexistence Metric
Submission
Page 3
Steve Shellhammer, Qualcomm, Inc.
June 2008
IEEE P802.19-08/0018r1
Several metrics will be used to evaluate the impact of 802.11n interference on the Bluetooth
network. The first metric is the raw Bluetooth packet error rate (PER), without retransmission.
This is useful to represent the impact on a standard Bluetooth SCO link. The second metric is
the packet error rate after retransmission (PERaR), which measures the packet error rate after the
eSCO retransmissions.
Coexistence Metric
Description
PER
Bluetooth packet error rate. This metric does not include
retransmission. It is indicative of the SCO audio quality
PERaR
Bluetooth packet error rate after eSCO retransmissions.
This is indicative of eSCO audio quality
Table 1: Coexistence Metrics
Submission
Page 4
Steve Shellhammer, Qualcomm, Inc.