1. Protection Assurance Method
Month Year
doc.: IEEE /1660r1
Nov 2006
Protection Assurance Method
Date:
Authors:
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kaberi banerjee, Stuart Kerry , NXP Semiconductors
kaberi banerjee, Stuart Kerry

2. Month Year
doc.: IEEE /1660r1
Nov 2006
Abstract
This presentation is associated with CID It attempts to address some deficiencies that exist in the proposed Greenfield protection mechanism that is covered by section
kaberi banerjee, Stuart Kerry , NXP Semiconductors
kaberi banerjee, Stuart Kerry

3. Nov 2006
Related CID
CID 4522 :
Comment : Green field protection. Transmission of GF PPDUs is not allowed when there is at least one non-HT or non-GF STA associated with the BSS;
Proposed Change :Change the statement to " All GF capable devices shall not transmit GF PPDUs when there is at least one non-HT or non-GF STA associated with this BSS.“
Status : COEX Deferred then passed to MAC: until TGn has determined whether or not to make Greenfield a mandatory part of the .11n spec.
kaberi banerjee, Stuart Kerry , NXP Semiconductors

4. Problem Definition Nov 2006
-- After the Association of the non-HT device and before the next Beacon interval,
The GF/HT devices are unaware of the presence of the non-HT device in the BSS;
kaberi banerjee, Stuart Kerry , NXP Semiconductors

5. Nov 2006
Solution Method
-- AP’s announcement of non-HT STA presence via a management Action Frame/Probe response frame ;
-- *** Note RIFS protection may not be needed on the basis of some recent resolution;
changes will be made to reflect the fact; the important point to notice is that there is a need to signal dynamically the change in state of protection status of the BSS.
kaberi banerjee, Stuart Kerry , NXP Semiconductors

6. Protection State Definition
Nov 2006
Protection State Definition
-- These bits together define the Protection state
kaberi banerjee, Stuart Kerry , NXP Semiconductors

7. BSA Protection Mechanisms
Nov 2006
BSA Protection Mechanisms
Two Mechanisms are available
Protection Within the BSS – indication of the applicability of a protection mechanism within the BSS;
Currently done via Beacon frames and the HT/ERP Information Element;
Protection of OBSS cases – indication may be done in a dynamic manner;
Changed state in the OBSS is recorded in an OBSS Information Element;
OBSS Information Element captures the Protection status bit and action bits as shown.
kaberi banerjee, Stuart Kerry , NXP Semiconductors

8. Frames used to announce Protection State change
Nov 2006
Frames used to announce Protection State change
Candidate Solutions : one of the following
-- Broadcast Management Action Frame – Protection Announcement Frame
- Compact;
- can accommodate variable lengths;
-- Probe Response Frame
- recognizable by all devices
- already a part of the implementations
-- Measurement Pilot Frames :
- periodic
- timestamp required
kaberi banerjee, Stuart Kerry , NXP Semiconductors

9. Protection Announcement Management Action Frame
Nov 2006
Protection Announcement Management Action Frame
kaberi banerjee, Stuart Kerry , NXP Semiconductors

10. References Draft –P802.11n/D1.06 Nov 2006
kaberi banerjee, Stuart Kerry , NXP Semiconductors