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AP discovery with FILS beacon

AP discovery with FILS beacon. Authors:. Date: 201 2 -1- 8. Jan 201 2. Abstract. In this presentation, current AP discovery mechanisms are summarized; FILS beacon is introduced to speedup the AP discovery. Jan 201 2. Conformance w/ TGai PAR & 5C. Jan 201 2. Introduction.

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AP discovery with FILS beacon

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  1. AP discovery with FILS beacon Authors: • Date: 2012-1-8 Yunbo Li et al ,Huawei.

  2. Jan 2012 Abstract • In this presentation, current AP discovery mechanisms are summarized; • FILS beacon is introduced to speedup the AP discovery. Huawei.

  3. Jan 2012 Conformance w/ TGai PAR & 5C Huawei.

  4. Jan 2012 Introduction Fast Initial link setup is required in TGai • High link setup time will be less than 100ms Two ways to discovery AP: • Passive scanning: passively receive Beacon • Active scanning: actively probe request/ probe response exchange Current discovery mechanisms don’t meet the requirement • Passive scanning is too slow, beacon period usually 100ms • Active scanning take much air time and easy to flood the network We introduce a FILS Beacon to speedup AP discovery Huawei

  5. Jan 2012 Problems in active scanning • One probe request will cause many probe response; • Probe request/ response exchange will flood the network when there are many STAs; • Mobile devices are battery consumption critical, while active scanning consume more power. Both figures are Cited from KDDI 1413r1 Occupied time Frames Huawei

  6. 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. Jan 2012 Slide 6 Huawei

  7. Jan 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. Huawei

  8. Jan 2012 Elements in FILS beacon • SSID • Network Identifier (optional) Huawei

  9. Jan 2012 Transmit pattern of FILS Beacon (1/2) • Option 1: • Predefine a set of transmit modes, and randomly choose one transmit mode; • E.g. evenly set 6 time points within a Beacon period, following is 9 predefined patterns, 1 means transmit while 0 means doesn’t. • Example of predefined patterns: [1 0 1 0 0 0] [1 0 0 1 0 0] [1 0 0 0 1 0] [0 1 0 1 0 0] [0 1 0 0 1 0] [0 1 0 0 0 1] [0 0 1 0 1 0] [0 0 1 0 0 1] [0 0 0 1 0 1] Huawei

  10. Transmit pattern of FILS Beacon (2/2) Jan 2012 • Option 2: • Set a time length T, AP will send out a FILS beacon if it doesn’t receive any of Beacon, Probe Responseor FILS beacon for T. • Option 3: • Periodically transmitted at a frequency higher than beacon. If transmit time is overlapped with beacon, only beacon will be transmitted. Slide 10 Huawei

  11. Jan 2012 Straw poll 1 • Do you agree to introduce the FILS beacon in slide 7 to speedup AP discovery? Huawei.

  12. Straw poll 2 Do you agree the elements of FILS in slide 8? Jan 2012 Slide 12 Huawei.

  13. Straw poll 3 • Which FILS beacon transmit pattern in slide 9 and 10 do you prefer? • Option 1 • Option 2 • Option 3 Jan 2012 Slide 13 Huawei.

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