AP discovery with FILS beacon Month Year doc.: IEEE 802.11-yy/xxxxr0 Mar 2012 AP discovery with FILS beacon Date: 2012-3-6 Authors: Name Affiliations Address Phone email Yunbo Li Huawei Technologies Co., Ltd. F1, Huawei Industrial Base, Bantian Longgang, Shenzhen 518129, China +86 15013596057 liyunbo@huawei.com Robert Sun Suite 400, 303 Terry Fox Drive, Kanata, Ontario K2K 3J1 +1 613 2871948 Rob.sun@huawei.com Edward Au +1 773 782 6875 Edward.au@huawei.com Osama Aboul-Magd +1 613 2871405 Osama.AboulMagd@huawei.com Junghoon Suh +1 613 2871315 Junghoon.suh@huawei.com Yunbo Li et al ,Huawei. John Doe, Some Company

Month Year doc.: IEEE 802.11-yy/xxxxr0 Mar 2012 Abstract In this presentation, the necessity of passive scanning during AP discovery is described; FILS beacon is introduced to accelerate the AP discovery. Huawei. John Doe, Some Company

Conformance w/ TGai PAR & 5C April 2009 doc.: IEEE 802.19-09/xxxxr0 Mar 2012 Conformance w/ TGai PAR & 5C Conformance Question Response 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? Does the proposal require or introduce a change to the 802.1 architecture? Does the proposal introduce a change in the channel access mechanism? Does the proposal introduce a change in the PHY? 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 Huawei. Rich Kennedy, Research In Motion

Introduction Fast Initial link setup is required in TGai Mar 2012 Introduction Fast Initial link setup is required in TGai High link setup time will be less than 100ms, which is hard to achieve when using current AP discovery techniques. Two ways to discovery AP: Passive scanning: indispensable in some scenario; usually take long time, and need to accelerate it for FILS Active scanning: Much quicker, but take much air time and easy to flood the network; Some filter or cooperate techniques are proposed for FILS; We introduce a FILS Beacon to accelerate AP discovery Huawei

Necessity of passive scanning Mar 2012 Necessity of passive scanning Radar band is overlapped with WiFi 5G band; Clause 10.9.4 of REVmb D12.0: A STA does not transmit in a channel unless the channel has been tested for the presence of radar transmissions according to regulatory requirements. Passive scanning is needed in Radar band; Current passive scanning need to be improved to meet the requirement of FILS; FILS beacon may be an effective method. Slide 5 Huawei

Problems in passive scanning Mar 2012 Problems in passive scanning Current beacon transmitted period (100ms) is too long for FILS; Increase the transmit frequency of Beacon will occupies much air time, because Beacon frame contains a large payload (usually > 100 Bytes); Increase the transmit frequency of Beacon will consume more power of mobile STAs. Slide 6 Huawei

Mar 2012 FILS Beacon Define a very short beacon (FILS beacon) to advertise AP, transmit it much more frequently; FILS beacon only contains several necessary element for discovery; FILS beacon will not replace the traditional Beacon frame, it will be sent much more frequently between traditional Beacons; Note：FILS beacon does not exclude active scanning; Huawei

Information in FILS beacon Mar 2012 Information in FILS beacon SSID Network Identifier (optional) Time to the next beacon …(other element that will help for FILS) Huawei

Simulation for FILS Beacon Mar 2012 Simulation for FILS Beacon NS-2 platform; 5 APs in the simulation; 5 unassociated STAs and 5 associated STAs for each AP; Each unassociated STAs need to find the AP with intended SSID; Regular Beacon with a BI of 100ms; There are only two elements in FILS Beacon: SSID (18 bytes) andTime to next beacon element (6 bytes); The simulation results are obtained from 15 independent experiments. Slide 9 Huawei

Simulation for FILS Beacon Mar 2012 Simulation for FILS Beacon Figure 1 Without background traffic Slide 10 Huawei

Simulation for FILS Beacon Mar 2012 Simulation for FILS Beacon Figure 2 Background traffic Slide 11 Huawei

Simulation for FILS Beacon Mar 2012 Simulation for FILS Beacon Figure 3 Background traffic Slide 12 Huawei

Simulation for FILS Beacon Mar 2012 Simulation for FILS Beacon Figure 4 Background traffic Slide 13 Huawei

What else after FILS beacon Mar 2012 What else after FILS beacon Pure passive scanning: Wait for the next beacon if the waiting time is short; switch to other channel to do further scanning if waiting time is long; Hybrid scanning: Send Probe Request frame with intended SSID, and AP reply with a broadcast Probe Response frame. (Cooperate info can be included for further improvement); Slide 14 Huawei

Conclusion FILS Beacon can reduce the AP discovery time; Mar 2012 Conclusion FILS Beacon can reduce the AP discovery time; It has a optimal number of FILS Beacon within a regular BI (100ms), it could be around 3; Propose: Design a specific MAC frame to accelerate the passive scanning of AP discovery for FILS. Slide 15 Huawei

Mar 2012 Straw poll 1 Do you agree the passive scanning need to improve for FILS? Slide 16 Huawei.

Mar 2012 Straw poll 2 Do you agree to introduce the FILS beacon in slides 7 and 8 to accelerate AP discovery? Slide 17 Huawei.