Fast Session Transfer Session Setup in TVWS Month Year doc.: IEEE 802.11-yy/xxxxr0 January 2011 Fast Session Transfer Session Setup in TVWS Date: 2011-01-07 Authors: Bahareh Sadeghi et al, Intel Corp. John Doe, Some Company

Month Year doc.: IEEE 802.11-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 proposal that resulted from offline discussions after the presentation to TGad in the LA meeting (slides #12-13) Normative Text corresponding to the proposal is in document 11/0xxxr0. Bahareh Sadeghi et al, Intel Corp. John Doe, Some Company

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.

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.

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.

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.

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.

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.

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.

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.

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 – withdrawn as it is not relevant to TGad Do you support the proposed method to trigger FST Session Setup initiation at the peer device? Y/N/Abstain 5-9-23 Bahareh Sadeghi et al, Intel Corp.

January 2011 Alternate Proposal-1 Assumptions – The peer devices know of each other capabilities, specifically the role the device plays in the context of TVWS (Mode-I or Mode-II device) Let the Mode-I initiate FST Session Setup (by sending the FST Session Setup Request message). Knowing that the initiator is a TVWS Mode-I device and that such devices cannot be initiators while switching to TVWS channels, the Mode-II device rejects the FST Session Setup Request that it received from the Mode-I device. Now TVWS Mode-II device has a trigger (that the TVWS Mode-I device initiated FST Session Setup Request), it initiates the FST Session Setup (probably using the parameters that it received in the FST Session Setup Request from the TVWS Mode-I device). Bahareh Sadeghi et al, Intel Corp.

Alternate Proposal: Flow diagrams January 2011 Alternate Proposal: Flow diagrams TVWS Mode-II device TVWS Mode-I device FST Session Setup Request FST Session Setup Response: Time-to-Start, Status = 90 Time-to-Start FST Session Setup Request Notes: No need for new action frames Add Time-to-Start to FST Session Setup Response frame; Time-to-Start indicates the time duration (in TUs) that the responder may take in order to start FST A new status code for FST Setup Request rejection need to be defined. Bahareh Sadeghi et al, Intel Corp.