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Doc.: IEEE 802.11-12/xxxr0 Submission Nov. 2012 Jonathan Segev (Intel)Slide 1 Rapid Scanning Procedure Date: 2012-11-01 Authors:

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Presentation on theme: "Doc.: IEEE 802.11-12/xxxr0 Submission Nov. 2012 Jonathan Segev (Intel)Slide 1 Rapid Scanning Procedure Date: 2012-11-01 Authors:"— Presentation transcript:

1 doc.: IEEE 802.11-12/xxxr0 Submission Nov. 2012 Jonathan Segev (Intel)Slide 1 Rapid Scanning Procedure Date: 2012-11-01 Authors:

2 doc.: IEEE 802.11-12/xxxr0 Submission Nov. 2012 Jonathan Segev (Intel)Slide 2 Abstract The presentation describes an improvement to the Active Scanning mechanism to reduce the delay on unused channels during the AP discovery phase. This presentation will focus on comparing the enhancement of Rapid Scan to Active Scan compared to the current status of only using Active Scan.

3 doc.: IEEE 802.11-12/xxxr0 Submission Nov. 2012 Jonathan Segev (Intel)Slide 3 Conformance w/ TGai PAR & 5C Conformance QuestionResponse Does the proposal degrade the security offered by Robust Security Network Association (RSNA) already defined in 802.11? No Does the proposal change the MAC SAP interface?No Does the proposal require or introduce a change to the 802.1 architecture?No Does the proposal introduce a change in the channel access mechanism?Yes Does the proposal introduce a change in the PHY?No Which of the following link set-up phases is addressed by the proposal? (1) AP Discovery (2) Network Discovery (3) Link (re-)establishment / exchange of security related messages (4) Higher layer aspects, e.g. IP address assignment 1

4 doc.: IEEE 802.11-12/xxxr0 Submission Recap, Active Rapid Scanning Rapid Scanning was presented during the last meeting: Benefits include: –Major latency improvement. –Major power improvement. –Does not needlessly load channels without 11ai support. Nov. 2012 Slide 4 MAC message Time uncertainty < Min_Probe_Response_Time G1 == SIFS G3 == DIFS Rapid Scan Request T STA performing Rapid Scan G1 ~230usec Probe Req STA performing Active Scan G3 Min_Probe_Response_Time ~5.350mse c STA waits 5msec for AP to response than switch to next channel No response identified STA goes to next channel within < 80usec

5 doc.: IEEE 802.11-12/xxxr0 Submission Probe Rsp Recap, Active Rapid Scanning Rapid Scanning was presented during the last meeting: Benefits include: –Major latency improvement. –Major power improvement. –Does not needlessly load channels without 11ai support. Nov. 2012 Slide 5 MAC message Time uncertainty < Min_Probe_Response_Time G1 == SIFS G3 == DIFS Rapid Scan Request T STA performing Rapid Scan G1 ~230usec Probe Req STA performing Active Scan G3 Min_Probe_Response_Time STA waits 10- 15msec only to discover non 11ai APs on channel. No response by non 11ai AP. STA goes to next channel within < 80usec Probe Rsp ACK Max_Probe_Response_Time

6 doc.: IEEE 802.11-12/xxxr0 Submission Recap, Active Rapid Scanning Concerns raised on the following: –Creation of a new control message (action frames are too slow to analyze and acknowledge). –Replying on ACK for a group broadcast address. We propose to answer these by using an acknowledged existing Probe Request message to achieve same goal of decreased scan duration. Nov. 2012 Slide 6

7 doc.: IEEE 802.11-12/xxxr0 Submission Using Probe Request for Rapid Scan By using a OUI and Probe Request –The OUI indicates an unicast address allocated to indicate FILS capable AP (same as in 11ae). –The Probe Request message indicates an ACK. –FILS capable AP acknowledges the Probe Request (non FILS capable AP ignores it). –STA identifies the ACK frame and continues to decode the medium for at least Min_Probe_Response_time; enabling the receiving of a Probe Response. –STA acknowledges the Probe Response. Nov. 2012 Slide 7 Probe Req Probe Response ACK T STA performing Rapid Scan FILS capable Responder # 1 SIFS T ACK Min_Probe_Response_Time SIFS MAC message Time uncertainty < Min_Probe_Response_Time

8 doc.: IEEE 802.11-12/xxxr0 Submission Using Probe Request for Rapid Scan If a single FILS capable AP operates over the channel: Nov. 2012 Slide 8 Probe Req Probe Response ACK T STA performing Rapid Scan FILS capable Responder # 1 SIFS T ACK Min_Probe_Response_Time SIFS MAC message Time uncertainty < Min_Probe_Response_Time

9 doc.: IEEE 802.11-12/xxxr0 Submission Using Probe Request for Rapid Scan If multiple FILS capable APs operates over the channel: Nov. 2012 Slide 9 Probe Req Probe Response ACK T STA performing Rapid Scan FILS capable Responder # 1 SIFS T ACK Min_Probe_Response_Time FILS capable Responder # 2 ACK DIFS SIFS Probe Response Max_Probe_Response_Time MAC message Time uncertainty < Min_Probe_Response_Time

10 doc.: IEEE 802.11-12/xxxr0 Submission Using Probe Request for Rapid Scan If only non FILS capable APs operates over the channel : Nov. 2012 Slide 10 Probe Req Non related MPDU T STA performing Rapid Scan Non FILS Capable AP SIFS T DIFS After SIFS + preamble STA switches to another channel. MAC message Time uncertainty < Min_Probe_Response_Time

11 doc.: IEEE 802.11-12/xxxr0 Submission Using Probe Request for Rapid Scan If no AP operates over the channel : Nov. 2012 Slide 11 Probe Req T STA performing Rapid Scan Non FILS Capable AP SIFS T After SIFS + preamble STA switches to another channel. MAC message Time uncertainty < Min_Probe_Response_Time

12 doc.: IEEE 802.11-12/xxxr0 Submission Summary Benefits of using Probe Request/Response for Rapid Scanning: –Reuse of existing resources and procedures (management message, ACK procedure). –Fast separation between regular and FILS capable (~1/10-1/20 of current duration). –Power efficient procedure enables more frequent polling supporting the faster automatic discovery. Nov. 2012 Slide 12

13 doc.: IEEE 802.11-12/xxxr0 Submission Nov. 2012 Jonathan Segev (Intel)Slide 13 Motion Insert the following text on clause 6 of the SFD (11-12/0151r12): The amendment will define a mechanism to reduces the FILS capable AP presence discovery duration. The procedure will enable the STA to identify FILS capable AP coverage within SIFS plus ACK message delay post request by STA by using decoding an ACK message or using CCA in case of a collision. Yes: No: Abstain:

14 doc.: IEEE 802.11-12/xxxr0 Submission Nov. 2012 Jonathan Segev (Intel)Slide 14 Backup

15 doc.: IEEE 802.11-12/xxxr0 Submission Probe Response Suggested Improvement Nov. 2012 Slide 15 Multiple APs respond after SIFS and identified by STA’s CCA Rapid Scan Request Probe Request T STA performing Rapid Scan Responder # 1 Responder # 2 G1 T T G3 STA sends a Rapid Scan Request MAC message Rapid Scan Ack Probe Response ACK Time uncertainty < Min_Probe_Response_Time G1 == SIFS G3 == DIFS Post AP coverage STA continues to perform active scanning AP coverage discovery Existing Active Scan procedure – AP identity discovery ~230usec~5-10msec

16 doc.: IEEE 802.11-12/xxxr0 Submission No response identified STA goes to next channel within ~80usec Suggested Improvement – in case of no AP Nov. 2012 Slide 16 Rapid Scan Request T STA performing Rapid Scan G1 MAC message Time uncertainty < Min_Probe_Response_Time G1 == SIFS G3 == DIFS ~230usec Probe Req STA performing Active Scan G3 Min_Probe_Response_Time ~5.350msec STA waits 5msec for AP to response than switch to next channel

17 doc.: IEEE 802.11-12/xxxr0 Submission Suggested Improvement – in case of only non 11ai capable APs Nov. 2012 Slide 17 No response identified STA goes to next channel within ~80usec with minimal impact on medium RSR T STA performing Rapid Scan G1 10usec ~230usec G1 ACK Probe Req T STA performing Rapid Scan G3 T T Probe Response Probe Response G3 G1 ACK Min_Probe_Response_Time Max_Probe_Response_Time = ~10msec STA takes up substantial medium resource. Procedure takes 10msec to identify no 11ai support.

18 doc.: IEEE 802.11-12/xxxr0 Submission Probe Response Suggested Improvement – mix of 11ai and non 11ai APs Nov. 2012 Slide 18 Multiple APs respond after SIFS and identified by STA’s CCA Rapid Scan Request Probe Request T STA performing Rapid Scan Responder # 1 Responder # 2 G1 T T G3 STA sends a Rapid Scan Request MAC message Rapid Scan Ack Probe Response ACK Time uncertainty < Min_Probe_Response_Time G1 == SIFS G3 == DIFS Post AP coverage STA continues to perform active scanning AP coverage discovery Existing Active Scan procedure – AP identity discovery ~230usec~10msec ~ ~ ~ ~ ~ ~

19 doc.: IEEE 802.11-12/xxxr0 Submission KPI comparison – Scan Time Idle Channel Nov. 2012 Jonathan Segev (Intel)Slide 19 Active Scan Total time w/o Rapid Scan = Number channels * (Probe Req + Min_Probe_Response_Time) Active Scan Total time w/ Rapid Scan = Number channels * (Rapid Scan Req + SIFS + ACK) Note: In this comparison, STA goes through a set of channels without AP coverage attempting to perform Active Scan or Rapid Scan. Active Scan takes 5msec per channel while Rapid Scan completes within 250usec.

20 doc.: IEEE 802.11-12/xxxr0 Submission KPI comparison – Scan Time Idle Channel Nov. 2012 Jonathan Segev (Intel)Slide 20 Full scan Korea = 9msec full scan w/ Rapid Scan vs. 194.4msec w/o Rapid Scan. Full scan Japan = 5.75msec full scan w/ Rapid Scan vs. 124.2msec w/o Rapid Scan. Note: In this comparison, STA goes through a set of channels without AP coverage attempting to perform Active Scan or Rapid Scan. Active Scan takes 5msec per channel while Rapid Scan completes within 250usec.

21 doc.: IEEE 802.11-12/xxxr0 Submission KPI comparison – Scan PWR Idle Channel Nov. 2012 Jonathan Segev (Intel)Slide 21 Active Scan PWR w/o Rapid Scan = Number channels * (Probe Req + Min_Probe_Response_Time) Active Scan PWR w/ Rapid Scan = Number channels * (Rapid Scan Req + SIFS + ACK) Note: Rapid Scan assumed 70usec Probe Req 350usec (conservative) Tx/Rx PWR ratio 1:5 Min_Probe_Response_Time, Max_Probe_Response_Time, DIFS, SFIS, probDelay, PLMP header and preamble, other…

22 doc.: IEEE 802.11-12/xxxr0 Submission KPI comparison – Scan PWR Idle Channel Nov. 2012 Jonathan Segev (Intel)Slide 22 Single full scan Korea = 1.14mJ/scan with Rapid Scan vs. 12.24mJ/full w/o Rapid Scan Note: Rapid Scan assumed 100usec Probe Req 350usec (conservative) Tx/Rx PWR ratio 1:5 Min_Probe_Response_Time, Max_Probe_Response_Time, DIFS, SFIS, probDelay, PLMP header and preamble, other…

23 doc.: IEEE 802.11-12/xxxr0 Submission KPI comparison – dense deployment delay Nov. 2012 Jonathan Segev (Intel)Slide 23 Notes: Apples to Apples In this comparison, if an 11ai capable AP was discovered by Rapid Req, a 2 nd stage of identifying AP identity using Active Scan is accounted for

24 doc.: IEEE 802.11-12/xxxr0 Submission KPI comparison – dense deployment PWR Nov. 2012 Jonathan Segev (Intel)Slide 24 Full scan Korea = 6.16mJ/Scan full Scan w/ Rapid vs. 14.49mJ/Scan w/o Rapid APs deployed at every 1 out of 4 channels Note: In this comparison, if an AP was discovered by Rapid Req, a 2 nd stage of identifying AP identity using Active Scan is accounted for

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