IEEE P802.15 Working Group for Wireless Personal Area Networks TM

May 2001 doc.: IEEE 802.15-01/243r0

Submission

Slide 1 Steve Shellhammer, Symbol Technologies

IEEE P802.15 Working Group for Wireless Personal Area NetworksTM

Presentation at In-Stat Forum on “Access To Intelligence”

Phoenix AZ

May 1, 2001

May 2001 doc.: IEEE 802.15-01/243r0

Submission


Bluetooth and IEEE 802.11b Coexistence

Stephen J. Shellhammer

Chairman IEEE 802.15.2

Coexistence Task Group

Senior Director, Symbol Technologies, Inc.

May 2001 doc.: IEEE 802.15-01/243r0

Submission


Mutual Interference

• Problem: Both IEEE 802.11 and Bluetooth operate in the same 2.4 GHz ISM Band.

• Problem: Bluetooth enabled devices will likely be portable and will need to operate in an IEEE 802.11 WLAN environment.

• Problem: There will be some level of mutual interference.

May 2001 doc.: IEEE 802.15-01/243r0

Submission


IEEE 802.15.2 Deliverables

• Coexistence Model– Quantify the effect of the mutual

interference of WLAN (e.g. 802.11) and WPAN (e.g. Bluetooth) upon one another.

• Coexistence Mechanisms– Mechanisms or techniques to facilitate

coexistence of WLAN and WPAN devices.

• Both to be documented in an IEEE Recommended Practice

May 2001 doc.: IEEE 802.15-01/243r0

Submission


Coexistence Model

• The purpose of this Coexistence Model is:– To quantify the effect of the mutual

interference under various scenarios.• WLAN in Laptop and Bluetooth in nearby PDA• WLAN and Bluetooth in the same Laptop

– To demonstrate the effectiveness of the adopted Coexistence Mechanism.

May 2001 doc.: IEEE 802.15-01/243r0

Submission


Coexistence Model

• The Coexistence Model consist of four sections,– Physical Layer Models of the 802.11 and

Bluetooth Radios– MAC Layer Models of both 802.11 and

Bluetooth– RF Channel Model of the Radio Channel– Data Traffic Models of the traffic over both

802.11 and Bluetooth networks.

May 2001 doc.: IEEE 802.15-01/243r0

Submission


Coexistence Model

• Input to the Model– Location of 802.11 and Bluetooth devices– Type of Data Traffic flowing over both the

802.11 and Bluetooth networks.

• Output of the Model– Network Throughput, for both 802.11 and

Bluetooth.– Network Latency, for both 802.11 and

Bluetooth.– Packet Error rate for voice link

May 2001 doc.: IEEE 802.15-01/243r0

Submission


Coexistence Model - Bluetooth SCO Link in the Presence of IEEE 802.11b

0.149816237

0.131798483

0.116618982

0.086149507

0.049573942

0.020111177

0.136063513

0.120695079

0.091650256

0.053314311

0.025346583

0.002607049

0.009682126

0.001928652

0.0089035

0.151558907

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.1 0.5 1 2 3 4 5 6

Distance of Interference Source (WLAN) from Slave (meters)

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HV1

HV3

May 2001 doc.: IEEE 802.15-01/243r0

Submission


Coexistence Model - IEEE 802.11b (11Mbps) in the Presence of Bluetooth

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0.5

0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

Distance of WLAN AP from Bluetooth Slave (meters)

Pro

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BT HV1 Interference

BT DM1 Interference

May 2001 doc.: IEEE 802.15-01/243r0

Submission


Coexistence Mechanisms

• Coexistence Mechanisms Facilitate Coexistence of WPAN & WLAN devices

• Submissions were given at,– November 2000 meeting– January 2001 meeting

• March 2001 meeting– Updated submissions– Voted on selection of mechanisms

May 2001 doc.: IEEE 802.15-01/243r0

Submission



• Collaborative Mechanisms– Some form of communication exists

between the WLAN and WPAN.– Use this link to provide fair sharing of

medium (i.e. air waves)

• Non-Collaborative Mechanisms– No communication between WLAN and

WPAN exists.– Techniques to minimize the effects of the

mutual interference

May 2001 doc.: IEEE 802.15-01/243r0

Submission



• Collaborative Mechanism (Only one)– Selected a joint proposal from Mobilian,

Symbol Technologies, and NIST.– Primarily a Coordinated Scheduling

Mechanism.

May 2001 doc.: IEEE 802.15-01/243r0

Submission



• Non-Collaborative (Multiple)– Selected Bluetooth Packet Selection and

Scheduling– Selected IEEE 802.11b Transmit Power

Control and Data Rate Scaling– Considering Bluetooth Adaptive Frequency

Hopping (More working being done by Ad Hoc committee)

May 2001 doc.: IEEE 802.15-01/243r0

Submission


IEEE 802.15 Web Site

• For more information see the IEEE 802.15 web site

• www.ieee802.org/15/

IEEE P802.15 Working Group for Wireless Personal Area Networks TM

Documents

Transcript of IEEE P802.15 Working Group for Wireless Personal Area Networks TM