1. Proposed Evaluation Methodology Additions
December 2009
doc.: IEEE /1160r1
December 2009
Proposed Evaluation Methodology Additions
Date:
Authors:
John R. Barr, JRBarr, Ltd.
John R. Barr, JRBarr, Ltd.

2. December 2009
doc.: IEEE /1160r1
December 2009
Abstract
Proposed update to TGad Evaluation Methodology to include declaration of how coexistence requirements from TGad PAR and Functional Requirements are handled.
John R. Barr, JRBarr, Ltd.
John R. Barr, JRBarr, Ltd.

3. TGad Coexistence Requirements
December 2009
TGad Coexistence Requirements
From the TGad PAR:
It is in the best interest of users and the industry to strive for a level of coexistence between wireless systems. VHT will investigate coexistence with other systems in the 60 GHz band.
One approach will be to investigate a common PHY between VHT and c, and adopt if feasible.
Another approach is a common coexistence mechanism that may be used by other 60 GHz systems
From TGad Functional Requirements:
[Req08] The system is required to support mechanisms that enable coexistence with other systems in the band including IEEE c systems.
John R. Barr, JRBarr, Ltd.

4. 60 GHz Coexistence Assumptions
December 2009
60 GHz Coexistence Assumptions
TGad will use same channel frequencies as c, ECMA-357, and WirelessHD; and avoid using a channel that is “occupied”.
c systems using a channel will broadcast superframe beacons at least once every 66mS identifying the piconet and when channel will be used during each superframe. If the beacon is sent using a mode other than the Single Carrier (SC) Common Mode Signaling (CMS), a sync frame using CMS will be sent each superframe.
c, ECMA-357, and WirelessHD devices transmit without LBT when CTA allocated for their use. (TDMA MAC)
John R. Barr, JRBarr, Ltd.

5. Possible Coexistence Mechanisms (1)
December 2009
Possible Coexistence Mechanisms (1)
Prior to starting a BSS, scan target channel for at least 100mS (or some other time larger than 66mS) for presence of other 60GHz traffic and only use channels that are available.
Only requires detection of preambles by AP if they are common with c.
If capable of receiving and decoding c beacons or sync frames, a BSS may be established in the same channel as long as transmissions are only scheduled during CAP (CMS beacon) or other open periods for each superframe.
Requires support for c CMS and ability to decode beacon or sync frame (similar formats) by all stations.
John R. Barr, JRBarr, Ltd.

6. Possible Coexistence Mechanisms (2)
December 2009
Possible Coexistence Mechanisms (2)
If AP is capable of joining a c piconet as a child piconet, it can allocate private time during each superframe and only schedule TGad channel availability during that time.
Requires support of c CMS and limited set of c MAC commands by the AP.
Non-AP devices only need to be able to listen to AP beacons and schedule transmissions during the allocated time.
John R. Barr, JRBarr, Ltd.

7. Evaluation Criteria (1)
December 2009
Evaluation Criteria (1)
Proposal has ability to avoid channels occupied by c and other 60GHz radio systems:
Add clause to section 2 for FR Req08:
2.3 Detection of Other 60GHz Systems for Coexistence (FR 2.3 Req08)
Synthetic test case to demonstrate compliance with requirements in [functional requirements section 2.3].
Single AP ready to establish BSS
One c piconet controller sending beacon every 66mS
Between AP and piconet controller varies from 1-5 meters
PHY channel corresponds to Home Living Room, Office Conference Room, and Enterprise Cubicle
Detection probability must be greater than 75%
John R. Barr, JRBarr, Ltd.

8. Evaluation Criteria (2)
December 2009
doc.: IEEE /1160r1
December 2009
Evaluation Criteria (2)
Add clause to section 4 for Coexistence Detection
4.5 Coexistence Detection
Probability of detection of c CMS preamble from 1-5 meters
Probability of detection of ECMA-387 beacon preamble from 1-5 meters
Probability of detection of proposed TGad beacon preamble by c device (looking for CMS preamble) from 1-5 meters
Probability of detection of proposed TGad breacon preamble by ECMA-587 device (looking for ECMA-587 beacon) from 1-5 meters
c CMA preamble defined in IEEE c-2009
ECMA-587 preamble defined in ECMA-587
John R. Barr, JRBarr, Ltd.
John R. Barr, JRBarr, Ltd.

9. References December 2009 11-09-1108-00-00ad-tg-docs-open-items.ppt
ad-evaluation-methodology.doc
ad-functional-requirements.doc
vht-60-ghz-par-nescom-form-plus-5cs.doc
ad-response-to c.ppt
ad-common-mode-signaling-cms-for-intersystem-coexistence-enhancement.ppt
ad-tg3c-dev-sync-frame-transmission-for-adjacent-piconet-coexistence.ppt
ad-topology-considerations-on-contention-based-directional-mac-simulation.ppt
ad-wirelesshd-coexistence.ppt
ad-Energy-Dectection-vs-Common-Mode-Signaling-Detection-for-Coexistence.ppt
IEEE Std c™-2009
ECMA-387
John R. Barr, JRBarr, Ltd.