1. Fast Session Transfer Session Setup in TVWS
Month Year
doc.: IEEE yy/xxxxr0
January 2011
Fast Session Transfer Session Setup in TVWS
Date:
Authors:
Bahareh Sadeghi et al, Intel Corp.
John Doe, Some Company

2. Month Year
doc.: IEEE yy/xxxxr0
January 2011
Abstract
Devices supporting TVWS radio in most cases will also support other Wi-Fi radios (2.4GHz, 5GHz and 60GHz)
Depending on the operating environment there is a need to be able to switch between these radios causing little or no impact to higher layer application performance.
Critical when the device is portable
This submission proposes a method to have a peer device start the TGad Fast Session Transfer Setup protocol to be usable in TVWS
Bahareh Sadeghi et al, Intel Corp.
John Doe, Some Company

3. Definitions Mode I Device
January 2011
Definitions
Mode I Device
Can Tx in a TVWS frequency if it sees a Mode II device on that channel
Cannot Tx until it sees an enabling signal from Mode II device
Needs to see a beacon or contact verification signal every 60 seconds to maintain Tx
Mode II Device
Inputs its location to the database and acquires allowed frequencies
Can pass on this frequency information to Mode I device that it is in communication with
Can initiate network with other Mode I devices
Bahareh Sadeghi et al, Intel Corp.

4. Motivation: When does FST Session Setup comes into play?
January 2011
Distance from the AP
AP – Mode-II
STA – Mode-1
Within the same room TGac/ad
Across one or more rooms, to the edge of a large home
a/b/g/n or ac in some cases
Far edges of the yard, > 300m from the AP (a large church or auditorium); TGaf
As the user moves between the room there is a need to keep the display application (~ 20Mbps goodput) work without any interruption. This means we need FST from .11ac/ad to .11a/b/g/n/ac to .11af and back.
Bahareh Sadeghi et al, Intel Corp.

5. January 2011
TGad FST State Machine
TVWS Mode-I STAs cannot FST ACK or initiate a frame exchange in a channel in TVWS without the TVWS Mode-II device transitioning to operating in the selected TVWS channel and beaconing in it.
Need a mechanism to ensure that the FST session setup is initiated by the TVWS Mode-II device all the time.
Define a new action frame for TVWS Mode-I device to request TVWS Mode-II device to initiate FST Session setup
Need a mechanism to ensure that the FST session setup is initiated by the TVWS Mode-II device all the time.
Bahareh Sadeghi et al, Intel Corp.

6. TVWS FST Session Setup January 2011 Current band New band
Mode-II Device
.11a/b/g/n/ac/ad
TVWS
FST session setup in .11a/b/g/n/ac/ad
FST session setup in TVWS
Mode-I
Send Start FST Session Setup action frame to Mode-2 device
Bahareh Sadeghi et al, Intel Corp.

7. Proposal Start FST Session Setup Request and Response action frames
January 2011
Proposal Start FST Session Setup Request and Response action frames
If the Mode-I device decides to transition to TVWS band, it sends the “Start FST Session Setup Request action frame” with the same parameter set that it would have used if it were to initiate FST Session Setup to the Mode-II device.
Mode-2 devices responds with a success or failure using a Start FST Session Setup Response action frame
If the Mode-2 device responds with a success, it also initiates the FST Session Setup
Bahareh Sadeghi et al, Intel Corp.

8. Proposed Action Frames
January 2011
Proposed Action Frames
Start FST Session Setup Request
Category = FST
Action = Start FST Session Setup Request
Dialog Token
LLT
Session Transition
Multi-band (optional)
Wakeup Schedule (optional)
Awake Window (optional)
Switching Stream (optional)
Resource/capability related IEs
Octets 1 4
Start FST Session Setup Response
Category = FST
Action = Start FST Session Setup Response
Dialog Token
Status Code = Fail or Success
Expected time to initiate FST Session setup (TUs)
LLT
Session Transition
Multi-band (optional)
Wakeup Schedule (optional)
Awake Window (optional)
Switching Stream (optional)
Resource/capability related IEs
Octets 1 2 4
Exactly the same as in Tgad FST Setup Request action frame
Bahareh Sadeghi et al, Intel Corp.

9. Flow diagrams January 2011 TVWS Mode-II device TVWS Mode-I device
Start FST Session Setup Request
Start FST Session Setup Response: Success
Expected time to initiate FST Session setup (TUs)
TGad FST Sesssion Setup Procedure
TVWS Mode-II device
TVWS Mode-I device
Start FST Session Setup Request
Start FST Session Setup Response: Fail
Bahareh Sadeghi et al, Intel Corp.

10. Summary FST Session Setup is critical to end user experience
January 2011
Summary
FST Session Setup is critical to end user experience
TGad FST Session Setup state machine does not change
New Start FST Session Setup Request/Response action frames are defined
Non TVWS implementations could use this mechanism to simplify FST Session Setup implementation, i.e. devices that choose never to be FST Session Setup initiators (as defined in TGad)
Bahareh Sadeghi et al, Intel Corp.

11. Straw Polls Do you agree that FST Session Setup is required for TVWS?
January 2011
Straw Polls
Do you agree that FST Session Setup is required for TVWS?
Y/N/Abstain
Do you support the proposed method to trigger FST Session Setup initiation at the peer device?
Bahareh Sadeghi et al, Intel Corp.