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

1. IEEE P802.15 Working Group for Wireless Personal Area NetworksTM Current Status of IEEE 802.15.2 WLAN/WPAN Coexistence Task Group Steve Shellhammer, Symbol Technologies

2. 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 Steve Shellhammer, Symbol Technologies

3. 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. Steve Shellhammer, Symbol Technologies

4. Coexistence Model • The Coexistence Model consist of four sections, • Physical Layer Models of the 802.11b and 802.15.1 (Bluetooth) Radios • MAC Layer Models of both 802.11b and 802.15.1 (Bluetooth) • RF Channel Model of the Radio Channel • Data Traffic Models of the traffic over both 802.11 and 802.15.1 (Bluetooth) networks. Steve Shellhammer, Symbol Technologies

5. Coexistence Mechanisms • 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 Steve Shellhammer, Symbol Technologies

6. Coexistence Mechanisms • Collaborative Mechanism (Only one) • Selected a joint proposal from Mobilian, Symbol Technologies, and NIST. • Primarily a Coordinated Scheduling Mechanism. • To be used when IEEE 802.11b and Bluetooth are to be co-located in the same unit (e.g. laptop computer) Steve Shellhammer, Symbol Technologies

7. Collaborative Mechanism • The Collaborative Coexistence Mechanism relies on physical signals between the two radios within a common unit (e.g. laptop). • These physical signals are used to coordinate timing of the WLAN and WPAN transmissions to avoid interference. Steve Shellhammer, Symbol Technologies

8. Coexistence Mechanisms • Non-Collaborative (Multiple) • Bluetooth Packet Selection and Scheduling • Bluetooth Adaptive Frequency Hopping Steve Shellhammer, Symbol Technologies

9. Bluetooth Packet Selection & Scheduling • The this is a non-collaborative mechanism in which the Bluetooth devices independently detect the presence of 802.11b and determine which channels are utilized by 802.11b. • Then the Bluetooth piconet does not transmit when it hops into one of the channel occupied by 802.11b. Steve Shellhammer, Symbol Technologies

10. Adaptive Frequency Hopping • Just like the Bluetooth Packet Scheduling technique, the this is a non-collaborative mechanism in which the Bluetooth devices independently detect the presence of 802.11b and determine which channels are utilized by 802.11b. • In AFH the Bluetooth piconet remaps its hopping sequence to “hop around” the frequency band occupied by 802.11b Steve Shellhammer, Symbol Technologies

11. Draft Recommended Practice • Word documents of each of the various clauses we presented at the July meeting. • Revisions of the various clauses are being reviewed on conference calls, due the cancellation of the September meeting. • The Editor is starting to integrate the clauses together in Framemaker. Steve Shellhammer, Symbol Technologies

12. Adaptive Frequency Hopping • There is continuing detailed technical work being done on the Adaptive Frequency Hopping specification. • This work is being done in conference calls, where the team reviews documents distributed over the email reflector. Steve Shellhammer, Symbol Technologies

13. FCC NPRM • Under Current FCC ruled Adaptive Frequency Hopping is only allowed for low-power (< 1 mw) Bluetooth devices. • In May 2001 the FCC issued a Notice of Proposed Rule Making. • If this Rule Making issues then Adaptive Frequency Hopping will be allowed under high-power Bluetooth devices. Steve Shellhammer, Symbol Technologies

14. Donation from OPNET Corporation • The OPNET Corporation has donated three time-limited licenses of their Network analysis tool to several small companies to support the work of 802.15.2. • These tools will be used to model Adaptive Frequency Hopping in an 802.11b environment to model performance improvements. Steve Shellhammer, Symbol Technologies

15. Liaison with Bluetooth SIG • Currently both the IEEE 802.15.2 Coexistence Task Group and the Bluetooth SIG Coexistence Working Group are developing specifications for Adaptive Frequency Hopping. • In July the 802.15 Chairman and the 802.15.2 Chairman sent a letter to the Bluetooth SIG General Manager and Board of Directors. 802.15-01/349r0. Steve Shellhammer, Symbol Technologies

16. Liaison with Bluetooth SIG • The letter requested that the Bluetooth SIG work with the IEEE 802.15.2 Task Group in agreeing on a common Adaptive Frequency Hopping specification. • The Bluetooth SIG agreed in principle to work together with the IEEE. Steve Shellhammer, Symbol Technologies

17. Liaison with Bluetooth SIG • However, the two organizations have been unable to exchange any technical information, due to Bluetooth SIG Intellectual Property rules. • We are currently at an impasse since the two organizations cannot exchange any technical information. Steve Shellhammer, Symbol Technologies