1. Improvement on Active Scanning
Month Year
doc.: IEEE yy/xxxxr0
May 2012
Improvement on Active Scanning
Date: 05/04/2012
Authors:
Name
Affiliations
Address
Phone
Yunsong Yang
Huawei Technologies
10180 Telesis Court, STE 165, San Diego, CA 92121
Guan Xin
Ping Fang
Phillip Barber
Huawei.
John Doe, Some Company

2. May 2012
Abstract
This presentation proposes improvement on active scanning. Home Network Identifier is proposed to be used to select AP with roaming agreement, and QoS requirements are proposed to be included in Probe Request to reduce useless AP responses.
Related sections of the SFD (12/0151r7)
6. Fast network discovery
6.1 Active scanning
Huawei.

3. Conformance w/ TGai PAR & 5C
April 2009
doc.: IEEE /xxxxr0
May 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. Background, related contributions
May 2012
Background, related contributions
12/0191r3: Call for Contributions to the TGai Specification Framework;
12/0151r7: Approved Proposed specification framework for Tgai
12/0206r1: Probe request with wildcard SSID will bring severe packet flooding
Multiple contributions have been submitted to ai TG regarding active scanning improvements, e.g.,
12/153 r7: The ai shall define a mechanism to enable selective active scanning.
12/0259r5: Additional filtering item can be used to filter out unnecessary probe responses.
12/0124r2: Include a network identifier in probe request to restrict the number of APs that respond to a broadcast probe request.
Huawei.

5. Roaming STA active scanning
May 2012
Roaming STA active scanning
Usage Scenario
When STA leave its home networks，it tend to scan for APs that are deployed by the network which have roaming agreements with its home network.
But usually user knows its home network , but doesn’t know the roaming agreement with other network.
When wildcard SSID is used , it will cause Probe response flooding.
Proposal
Roaming STA can include Home network identifier in Probe Request
AP send probe response if it has roaming agreement with the STA’s home network and meet the other requirement of the Probe Request
Huawei.

6. Active scanning with QoS requirement
May 2012
Active scanning with QoS requirement
Problem
Now it is not until ADDTS that STA can express its QoS requirement to AP, and if the AP can’t meet its requirement, the whole link setup time will be wasted
QoS requirement available for AP discovery
A sta connect to a AP and is playing a online song, and the STA is moving. Once it lose the connection of the AP, it can’t handover another AP with service continuity, so it wants to find another AP which can support online song playing ASAP
For smart phone, when you try to run some APP, the phone will popup with some APs for you to choose
Proposal
STA can include QoS requirements in Probe Request
AP send probe response if it can meet the QoS requirement and other filter information from the Probe Request
Huawei.

7. Benefits Reduction Response packet transmission
May 2012
Benefits
Reduction Response packet transmission
Reduction of overall AP discovery time
Huawei.

8. May 2012
Straw Poll 1
Do you agree to add the sentence to section 6.1 Active Scanning of TGai SFD, 12/0151r7.
“An STA may include an home network identifier to its Probe Request to indicate selection for an AP which has roaming agreement with the home network.”
Yes:
No:
Abstain:
Huawei

9. May 2012
Straw Poll 2
Do you agree to add the sentence to section 6.1 Active Scanning of TGai SFD, 12/0151r7.
“An STA may include QoS requirements (e.g., Bandwidth Allowance, Delay tolerance) information in the Probe Request to indicate selection for APs which can meet the specific QoS requirements.”
Yes:
No:
Abstain:
Huawei

10. May 2012
Motion 1
Do you agree to add the sentence to section 6.1 Active Scanning of TGai SFD, 12/0151r7.
“An STA may include an home network identifier to its Probe Request to indicate selection for an AP which has roaming agreement with the home network.”
Yes:
No:
Abstain:
Huawei

11. May 2012
Motion 2
Do you agree to add the sentence to section 6.1 Active Scanning of TGai SFD, 12/0151r7.
“An STA may include QoS requirements (e.g., Bandwidth Allowance, Delay tolerance) information in the Probe Request to indicate selection for APs which can meet the specific QoS requirements.”
Yes:
No:
Abstain:
Huawei