1. Extended Channel Switch Announcement for TGn
January 2007
doc.: IEEE /0006r0
January 2007
Extended Channel Switch Announcement for TGn
Date:
Authors:
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Bjorn A. Bjerke, Qualcomm, Inc.
Bjorn A. Bjerke, Qualcomm, Inc.

2. January 2007
doc.: IEEE /0006r0
January 2007
Abstract
This presentation summarizes the proposal to specify an Extended Channel Switch Announcement in the n draft. Draft text can be found in document n-extended-channel-switch-announcement-tgn.
Proposal also resolves 8 letter ballot comments related to clause Channel Management at the AP.
Bjorn A. Bjerke, Qualcomm, Inc.
Bjorn A. Bjerke, Qualcomm, Inc.

3. Extended Channel Switch Announcement
January 2007
Extended Channel Switch Announcement
Extended Channel Switch Announcement (E-CSA) is a mechanism for relocating a BSS/IBSS to a different channel while maintaining existing associations
E-CSA is an extended version of the Channel Switch Announcement (CSA) introduced by .11h for relocating BSS to different channel when radar is detected (mandatory in majority of 5 GHz bands)
E-CSA brings CSA feature to all bands (2.4/3.7/5 GHz)
E-CSA may also be used for simultaneous BSS relocation and switching between 20 MHz and 20/40 MHz operation
E-CSA proposed and adopted by TGy Draft 1.0 as well as TGv Draft 0.05
 Very useful feature that should be employed by TGn as well
Bjorn A. Bjerke, Qualcomm, Inc.

4. January 2007
E-CSA vs CSA
CSA:
E-CSA:
Bjorn A. Bjerke, Qualcomm, Inc.

5. E-CSA Fields Fields: Length: set to 4
January 2007
E-CSA Fields
Fields:
Length: set to 4
Channel Switch Mode: indicates any restrictions on transmissions until the channel switch time
New Regulatory Class: the regulatory class to which the AP is moving, as given in Annex J; uniquely defines the position of the secondary channel relative to the primary channel in 40 MHz channels
New Channel Number: the channel number of the new (primary) channel to which the AP is moving
Channel Switch Count: the number of TBTTs until the AP switches to the new channel
Bjorn A. Bjerke, Qualcomm, Inc.

6. January 2007
E-CSA Usage
Mandatory for all HT STA; HT AP uses E-CSA to switch within or between regulatory classes regardless of band and 20/40 MHz capability
When using E-CSA IE in “.11h” bands, AP may also transmit legacy CSA IE to accommodate .11h STAs (may transmit CSA frame with E-CSA IE appended); CSA and E-CSA shall point to same primary channel
An HT STA associated with HT AP shall ignore legacy CSA
E-CSA IE is sent in Beacon and Probe Response frames
Also defined E-CSA frame for use in BSS with no legacy STA (identical to TGy/TGv)
Bjorn A. Bjerke, Qualcomm, Inc.

7. Additional Changes to TGn Draft to Accommodate E-CSA
January 2007
Additional Changes to TGn Draft to Accommodate E-CSA
Add Supported Regulatory Classes IE to Association and Reassociation Request/Response frames
Secondary Channel Offset IE no longer needed  delete
Usage rules specified in Channel management at the AP; also resolves 8 Letter Ballot comments
Bjorn A. Bjerke, Qualcomm, Inc.

8. References 11-06-1775-01-000n-extended-channel-switch-announcement-tgn
January 2007
References
n-extended-channel-switch-announcement-tgn
Bjorn A. Bjerke, Qualcomm, Inc.