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doc.: IEEE 802.11-12/0249r0
Submission
March 2012
Slide 1 Lin Cai et al ,Huawei.
Differentiated Association Service Provisioning in WiFi Networks
Date: 03/02/2012Authors:
Name Affiliations Address Phone email
Lin Cai Huawei 3601 Algonquin Road, Rolling Meadows, IL 60008
1-847-818-1778
George Calcev
Huawei 3601 Algonquin Road, Rolling Meadows, IL 60008
1-847-818-1778
Bin Chen Huawei 3601 Algonquin Road, Rolling Meadows, IL 60008
1-847-818-1778
Ping Fang Huawei Shenzhen, China 86-755-683-9346
Rob Sun Huawei Suite 400, 303 Terry Fox Drive, Kanata, Ontario K2K 3J1
1-613-287-1948 [email protected]
doc.: IEEE 802.11-12/0249r0
Submission
Abstract
• This presentation proposes differentiated association service in WiFi networks to improve the latency of association as well as QoS performance of users
March 2012
Lin Cai et al ,Huawei.Slide 2
doc.: IEEE 802.11-12/0249r0
Submission
Conformance w/ TGai PAR & 5C
Lin Cai et al ,Huawei.Slide 3
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? 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? No
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
3
March 2012
doc.: IEEE 802.11-12/0249r0
Submission
Introduction
• Mobile hotspots use case [1]• A train has a mobile hotspot that connects to the Internet; and users
onboard can connect to the AP and enjoy online gaming, videoing, web browsing, file transfer, and social networking, etc.
• When a train enters the train station, users will leave the train and try to connect to the AP at the train station simultaneously
March 2012
Lin Cai et al ,Huawei.Slide 4
doc.: IEEE 802.11-12/0249r0
Submission
Problem Statement
• Bursty user association– Users arrives in a bursty manner– Severe collisions result from a large number of users attempting to
associate with the AP simultaneously – Only a few users may be able to successfully associate with the AP
during a certain time interval– Due to the bursty association requests, the QoS of existing traffic is
highly affected
• Objective– To improve the association performance of users– To reduce the impact on the existing users already associated with
the AP
March 2012
Lin Cai et al ,Huawei.Slide 5
doc.: IEEE 802.11-12/0249r0
Submission
Facts
• Users have a diversity of multimedia applications with different quality of service (QoS) requirements– Realtime (video streaming) vs non-realtime (ftp file downloading)
– Delay sensitive (voice) vs delay tolerant (http traffic)
• Users may have different delay tolerance levels for network association; greedy/immediate association only reduces the association efficiency but not guarantee fast link setup
March 2012
Lin Cai et al ,Huawei.Slide 6
doc.: IEEE 802.11-12/0249r0
Submission
Proposed Solution
• Differentiated association service– Allow users to use different priorities to associate with the AP
– High priority users can immediately attempt to associate with the AP; low priority users should defer their association for a duration so that give high priority users more chance to associate first
– For instance, the association priority could be allocated by the operator policy rules or based on the type of traffic classes active during the (re-)association process
March 2012
Lin Cai et al ,Huawei.Slide 7
doc.: IEEE 802.11-12/0249r0
Submission
March 2012
Lin Cai et al ,Huawei.Slide 8
Example
t0 t1 t2 t3Class 1 Class 1 & 2 Class 1 & 2 & 3 Class 1&2&3&4
• The train stops in the station at the instance t0, when all users start their association process
• Class 1 (with the highest priority) can attempt to associate with the AP immediately at t0
• Class 2 defers association and starts at t1; and class 3 and class 4 (lowest priority) starts at a later time of t2 and t3, respectively
• EDCA can be applied to further improve differentiated services
Class 1 Class 2 Class 3 Class 4
doc.: IEEE 802.11-12/0249r0
Submission
Reference
• [1] IEEE 802.11-11/0797r0, “Use Case: Mobile hotspot”, May 2011.
March 2012
Lin Cai et al ,Huawei.Slide 9
doc.: IEEE 802.11-12/0249r0
Submission
Stroll Poll
• Do you agree that FILS devices should support differentiated association services with different priorities?
• Yes:
• No:
• Abstain:
March 2012
Lin Cai et al ,Huawei.Slide 10
