1. AP discovery with FILS beacon
Month Year
doc.: IEEE yy/xxxxr0
Jan 2012
AP discovery with FILS beacon
Date:
Authors:
Name
Affiliations
Address
Phone
Yunbo Li
Huawei Technologies Co., Ltd.
F1, Huawei Industrial Base, Bantian Longgang, Shenzhen , China
Robert Sun
Suite 400, 303 Terry Fox Drive, Kanata, Ontario K2K 3J1
Edward Au
Osama Aboul-Magd
Junghoon Suh
Yunbo Li et al ,Huawei.
John Doe, Some Company

2. Month Year
doc.: IEEE yy/xxxxr0
Jan 2012
Abstract
In this presentation, current AP discovery mechanisms are summarized;
FILS beacon is introduced to speedup the AP discovery.
Huawei.
John Doe, Some Company

3. Conformance w/ TGai PAR & 5C
April 2009
doc.: IEEE /xxxxr0
Jan 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 ? No
Does the proposal change the MAC SAP interface?
Does the proposal require or introduce a change to the 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

4. Introduction Fast Initial link setup is required in TGai
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. Problems in active scanning
Jan 2012
Problems in active scanning
Both figures are Cited from KDDI 1413r1
Frames
Occupied time
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.
Huawei

6. Problems in passive scanning
Jan 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

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

9. Transmit pattern of FILS Beacon (1/2)
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: [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ]
Huawei

10. Transmit pattern of FILS Beacon (2/2)
Jan 2012
Transmit pattern of FILS Beacon (2/2)
Option 2:
Set a time length T, AP will send out a FILS beacon if it doesn’t receive any of Beacon, Probe Response or 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
Huawei.

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