Presentation is loading. Please wait.

Presentation is loading. Please wait.

Submission doc.: IEEE 11-11/1414r2 November 2011 Katsuo Yunoki, KDDI R&D LaboratoriesSlide 1 Probe Request and Response in TGai Date: 2011-11-02 Authors:

Published bySarah Johnston Modified over 8 years ago

Similar presentations

Presentation on theme: "Submission doc.: IEEE 11-11/1414r2 November 2011 Katsuo Yunoki, KDDI R&D LaboratoriesSlide 1 Probe Request and Response in TGai Date: 2011-11-02 Authors:"— Presentation transcript:

1 Submission doc.: IEEE 11-11/1414r2 November 2011 Katsuo Yunoki, KDDI R&D LaboratoriesSlide 1 Probe Request and Response in TGai Date: 2011-11-02 Authors:

2 Submission doc.: IEEE 11-11/1414r2 November 2011 Katsuo Yunoki, KDDI R&D LaboratoriesSlide 2 Abstract This document describes a technical proposal for TGai which addresses the following phase. AP Discovery

3 Submission doc.: IEEE 11-11/1414r2November 2011 Katsuo Yunoki, KDDI R&D LaboratoriesSlide 3 Conformance w/ TGai PAR & 5C Conformance QuestionResponse 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 1

4 Submission doc.: IEEE 11-11/1414r2November 2011 Katsuo Yunoki, KDDI R&D LaboratoriesSlide 4 Time occupied situation in the real case was presented in Doc. 11-11/1413r0. The time occupied rate will become higher and higher because of Smartphone increasing. Thus, we have to consider reducing needless packet exchanges which occur packet collisions and bigger latency in order to obtain the FILS advantages effectively. Background

5 Submission doc.: IEEE 11-11/1414r2November 2011 Katsuo Yunoki, KDDI R&D LaboratoriesSlide 5 Probe Request / Response In order to search the surrounding APs, a STA receives Beacon and transmit Probe Request in Broadcast. APs transmit Probe Response for responding received Probe Requests in unicast. AP1STAAP2AP3AP4 Probe Request (wildcard) Probe Response

6 Submission doc.: IEEE 11-11/1414r2November 2011 Katsuo Yunoki, KDDI R&D LaboratoriesSlide 6 Example of Probe Request This STA transmits multiple “Probe Request” about every 15 seconds. 5 Probe Requests were observed around time stamp of 104 seconds. * Source MAC address was modified. NoTimesourcedestinationInfo 72.980854 48:XX:bc:bc:a3:X X BroadcastProbe Request, SN=2207, FN=0, Flags=........C, SSID=Broadcast 73.001232 48:XX:bc:bc:a3:X X BroadcastProbe Request, SN=2208, FN=0, Flags=........C, SSID=Broadcast 73.024225 48:XX:bc:bc:a3:X X BroadcastProbe Request, SN=2209, FN=0, Flags=........C, SSID=Broadcast 73.044726 48:XX:bc:bc:a3:X X BroadcastProbe Request, SN=2210, FN=0, Flags=........C, SSID=Broadcast 73.068847 48:XX:bc:bc:a3:X X BroadcastProbe Request, SN=2211, FN=0, Flags=........C, SSID=Broadcast 73.087848 48:XX:bc:bc:a3:X X BroadcastProbe Request, SN=2212, FN=0, Flags=........C, SSID=Broadcast 88.829271 48:XX:bc:bc:a3:X X BroadcastProbe Request, SN=2229, FN=0, Flags=........C, SSID=Broadcast 88.872488 48:XX:bc:bc:a3:X X BroadcastProbe Request, SN=2231, FN=0, Flags=........C, SSID=Broadcast 88.892895 48:XX:bc:bc:a3:X X BroadcastProbe Request, SN=2232, FN=0, Flags=........C, SSID=Broadcast 88.915885 48:XX:bc:bc:a3:X X BroadcastProbe Request, SN=2233, FN=0, Flags=........C, SSID=Broadcast 1104.676169 48:XX:bc:bc:a3:X X BroadcastProbe Request, SN=2251, FN=0, Flags=........C, SSID=Broadcast 2104.69654 48:XX:bc:bc:a3:X X BroadcastProbe Request, SN=2252, FN=0, Flags=........C, SSID=Broadcast 3104.720389 48:XX:bc:bc:a3:X X BroadcastProbe Request, SN=2253, FN=0, Flags=........C, SSID=Broadcast 4104.740292 48:XX:bc:bc:a3:X X BroadcastProbe Request, SN=2254, FN=0, Flags=........C, SSID=Broadcast 5104.762662 48:XX:bc:bc:a3:X X BroadcastProbe Request, SN=2255, FN=0, Flags=........C, SSID=Broadcast 135.522181 48:XX:bc:bc:a3:X X BroadcastProbe Request, SN=2273, FN=0, Flags=........C, SSID=Broadcast 135.54242 48:XX:bc:bc:a3:X X BroadcastProbe Request, SN=2274, FN=0, Flags=........C, SSID=Broadcast 135.565428 48:XX:bc:bc:a3:X X BroadcastProbe Request, SN=2275, FN=0, Flags=........C, SSID=Broadcast 135.585791 48:XX:bc:bc:a3:X X BroadcastProbe Request, SN=2276, FN=0, Flags=........C, SSID=Broadcast 135.608792 48:XX:bc:bc:a3:X X BroadcastProbe Request, SN=2277, FN=0, Flags=........C, SSID=Broadcast 135.62938 48:XX:bc:bc:a3:X X BroadcastProbe Request, SN=2278, FN=0, Flags=........C, SSID=Broadcast

7 Submission doc.: IEEE 11-11/1414r2November 2011 Katsuo Yunoki, KDDI R&D LaboratoriesSlide 7 Example of Probe Response 3 SSID were responded for probe requests. 26 probe responses were observed for 5 probe requests in Slide 7. NoTime stampsourcedestinationInto 1104.678041Matsushi_c5:XX:c0 48:XX:bc:bc:XX:2 b Probe Response, SN=1983, FN=0, Flags=..m.....C, BI=100, SSID=AAA 2104.679289Matsushi_c5:XX:c1 48:XX:bc:bc:XX:2 b Probe Response, SN=1984, FN=0, Flags=..m.....C, BI=100, SSID=BBB 3104.680289Matsushi_c5:XX:c1 48:XX:bc:bc:XX:2 b Probe Response, SN=1984, FN=0, Flags=..m.R...C, BI=100, SSID=BBB 4104.681294Matsushi_c5:XX:c1 48:XX:bc:bc:XX:2 b Probe Response, SN=1984, FN=0, Flags=..m.R...C, BI=100, SSID=BBB 5104.682414Matsushi_c5:XX:c6 48:XX:bc:bc:XX:2 b Probe Response, SN=1985, FN=0, Flags=........C, BI=100, SSID=CCC 6104.683417Matsushi_c5:XX:c6 48:XX:bc:bc:XX:2 b Probe Response, SN=1985, FN=0, Flags=....R...C, BI=100, SSID=CCC 7104.722046Matsushi_c5:XX:c0 48:XX:bc:bc:XX:2 b Probe Response, SN=1989, FN=0, Flags=..m.....C, BI=100, SSID=AAA 8104.723294Matsushi_c5:XX:c1 48:XX:bc:bc:XX:2 b Probe Response, SN=1990, FN=0, Flags=..m.....C, BI=100, SSID=BBB 9104.724538Matsushi_c5:XX:c6 48:XX:bc:bc:XX:2 b Probe Response, SN=1991, FN=0, Flags=........C, BI=100, SSID=CCC 10104.741788Matsushi_c5:XX:c0 48:XX:bc:bc:XX:2 b Probe Response, SN=1992, FN=0, Flags=..m.....C, BI=100, SSID=AAA 11104.742788Matsushi_c5:XX:c0 48:XX:bc:bc:XX:2 b Probe Response, SN=1992, FN=0, Flags=..m.R...C, BI=100, SSID=AAA 12104.743665Matsushi_c5:XX:c0 48:XX:bc:bc:XX:2 b Probe Response, SN=1992, FN=0, Flags=..m.R...C, BI=100, SSID=AAA 13104.744913Matsushi_c5:XX:c1 48:XX:bc:bc:XX:2 b Probe Response, SN=1993, FN=0, Flags=..m.....C, BI=100, SSID=BBB 14104.746167Matsushi_c5:XX:c6 48:XX:bc:bc:XX:2 b Probe Response, SN=1994, FN=0, Flags=........C, BI=100, SSID=CCC 15104.764165Matsushi_c5:XX:c0 48:XX:bc:bc:XX:2 b Probe Response, SN=1995, FN=0, Flags=..m.....C, BI=100, SSID=AAA 16104.76516Matsushi_c5:XX:c0 48:XX:bc:bc:XX:2 b Probe Response, SN=1995, FN=0, Flags=..m.R...C, BI=100, SSID=AAA 17104.766049Matsushi_c5:XX:c0 48:XX:bc:bc:XX:2 b Probe Response, SN=1995, FN=0, Flags=..m.R...C, BI=100, SSID=AAA 18104.767043Matsushi_c5:XX:c0 48:XX:bc:bc:XX:2 b Probe Response, SN=1995, FN=0, Flags=..m.R...C, BI=100, SSID=AAA 19104.768286Matsushi_c5:XX:c1 48:XX:bc:bc:XX:2 b Probe Response, SN=1996, FN=0, Flags=..m.....C, BI=100, SSID=BBB 20104.769288Matsushi_c5:XX:c1 48:XX:bc:bc:XX:2 b Probe Response, SN=1996, FN=0, Flags=..m.R...C, BI=100, SSID=BBB 21104.770289Matsushi_c5:XX:c1 48:XX:bc:bc:XX:2 b Probe Response, SN=1996, FN=0, Flags=..m.R...C, BI=100, SSID=BBB 22104.77129Matsushi_c5:XX:c1 48:XX:bc:bc:XX:2 b Probe Response, SN=1996, FN=0, Flags=..m.R...C, BI=100, SSID=BBB 23104.784916Matsushi_c5:XX:c0 48:XX:bc:bc:XX:2 b Probe Response, SN=1998, FN=0, Flags=..m.....C, BI=100, SSID=AAA 24104.785787Matsushi_c5:XX:c0 48:XX:bc:bc:XX:2 b Probe Response, SN=1998, FN=0, Flags=..m.R...C, BI=100, SSID=AAA 25104.786788Matsushi_c5:XX:c0 48:XX:bc:bc:XX:2 b Probe Response, SN=1998, FN=0, Flags=..m.R...C, BI=100, SSID=AAA 26104.787662Matsushi_c5:XX:c0 48:XX:bc:bc:XX:2 b Probe Response, SN=1998, FN=0, Flags=..m.R...C, BI=100, SSID=AAA

8 Submission doc.: IEEE 11-11/1414r2November 2011 Katsuo Yunoki, KDDI R&D LaboratoriesSlide 8 Considerations “Probe Request / Response” cause packet flooding even if the STA doesn’t have any connecting capabilities to surrounding APs. Transmitting “Probe Request” every 15 seconds doesn’t help the fast AP discovery. As mentioned in Doc. 11-11/1413r1, probe responses existed 5 times more than probe requests at that monitored public space. Avoiding needless packets may bring clearer WLAN air circumstances.

9 Submission doc.: IEEE 11-11/1414r2November 2011 Katsuo Yunoki, KDDI R&D LaboratoriesSlide 9 Probe exchanges Assumption-1 If 5 APs are installed in public space, 5 probe responses will be transmitted for a probe request with wildcard SSID. STAAP1AP2AP3AP4AP5 Probe Req. (wildcard SSID) Probe Res. (unicast)

10 Submission doc.: IEEE 11-11/1414r2November 2011 Katsuo Yunoki, KDDI R&D LaboratoriesSlide 10 Probe exchanges Assumption-2 If 5 STAs enter into the same place, 25 probe responses will be transmitted. AP1AP2AP3AP4AP5 STA1STA2STA3STA4STA5

11 Submission doc.: IEEE 11-11/1414r2November 2011 Katsuo Yunoki, KDDI R&D LaboratoriesSlide 11 Probe exchanges Assumption-3 What happens when a crowded train enter into the same place? AP1AP2AP3AP4AP5 STA How many probes will be exchanged???

12 Submission doc.: IEEE 11-11/1414r2November 2011 Katsuo Yunoki, KDDI R&D LaboratoriesSlide 12 Why not use Beacons for AP discovery? Beacon is including the almost same IEs as Probe Response. Beacon is transmitted in every 100 milliseconds. A STA can receive 150 Beacons during transmitting 1 Probe Request, if it would transmit Probe Request in every 15 seconds. It would be sufficient for a STA to discover AP with the target SSID by Beacons. Mobile devices (Smart-phones) are battery consumption critical. So it is preferable for mobile devices not to transmit “Probe Requests”, if possible.

13 Submission doc.: IEEE 11-11/1414r2November 2011 Katsuo Yunoki, KDDI R&D LaboratoriesSlide 13 Is Probe Request with wildcard SSID necessary for AP discovery? Why so? I’m thinking that even Probe Request with a specific target SSID isn’t necessary for AP discovery of public Wi-Fi hotspots. Stealth APs should be discovered by Probe Request/Response exchanges. But it isn’t by Probe Request with wildcard SSID. Open discussion

14 Submission doc.: IEEE 11-11/1414r2November 2011 Katsuo Yunoki, KDDI R&D LaboratoriesSlide 14 I’d like to propose that: TGai compliant STAs shall not use the wildcard SSID in SSID element of “Probe Request”. TGai compliant APs shall not transmit “Probe Response” for “Probe Request” with the wildcard SSID. More TGai compliant devices would be deployed, clearer WLAN circumstances might be realized!! Proposal

15 Submission doc.: IEEE 11-11/1414r2November 2011 Katsuo Yunoki, KDDI R&D LaboratoriesSlide 15 References doc.: IEEE 11-11/1413r0

Download ppt "Submission doc.: IEEE 11-11/1414r2 November 2011 Katsuo Yunoki, KDDI R&D LaboratoriesSlide 1 Probe Request and Response in TGai Date: 2011-11-02 Authors:"

Similar presentations

Doc.:IEEE 802.11-11/1523r4 Submission November 2011 Access Delay Reduction for FILS: Network Discovery & Access congestion Improvements Slide 1 Authors:

Doc.:IEEE /1523r4 Submission November 2011 Access Delay Reduction for FILS: Network Discovery & Access congestion Improvements Slide 1 Authors:
Submission doc.: IEEE 11-11/1413r4 January 2012 Katsuo Yunoki, KDDI R&D LaboratoriesSlide 1 Real Air-time Occupation by Beacon and Probe Date: 2012-01-12.

Submission doc.: IEEE 11-11/1413r4 January 2012 Katsuo Yunoki, KDDI R&D LaboratoriesSlide 1 Real Air-time Occupation by Beacon and Probe Date:
Doc.: IEEE 802.11-12/0567r1 Submission May 2012 Huawei Slide 1 Multiple Frequency Channel Scanning Date: 2012-05-04 Authors: NameAffiliationsAddressPhoneemail.

Doc.: IEEE /0567r1 Submission May 2012 Huawei Slide 1 Multiple Frequency Channel Scanning Date: Authors: NameAffiliationsAddressPhone .
Doc.: IEEE 802.11-12/0537r0 Submission May 2012 Jonathan Segev (Intel)Slide 1 Passive and Active Scanning Mixture Date: 2012-05-02 Authors:

Doc.: IEEE /0537r0 Submission May 2012 Jonathan Segev (Intel)Slide 1 Passive and Active Scanning Mixture Date: Authors:
Doc.: IEEE 802.11-11/1498-01-00ai Submission NameAffiliationsAddressPhoneemail Phillip BarberHuawei Technologies Co., Ltd. 1700 Alma Rd, Ste 500 Plano,

Doc.: IEEE / ai Submission NameAffiliationsAddressPhone Phillip BarberHuawei Technologies Co., Ltd Alma Rd, Ste 500 Plano,
Submission doc.: IEEE 11-12-0406-03-00ai May 2012 InterDigital, KDDI, Nokia, Huawei, Intel, Qcomm Slide 1 Proposed SFD Text for 802.11ai Passive Scanning.

Submission doc.: IEEE ai May 2012 InterDigital, KDDI, Nokia, Huawei, Intel, Qcomm Slide 1 Proposed SFD Text for ai Passive Scanning.
Doc.: IEEE 802.11-11/1169r1 Submission January 2012 Jihyun Lee, LG ElectronicsSlide 1 FILS Association Date: 2012-01-17 Authors: NameAffiliationsAddressPhoneemail.

Doc.: IEEE /1169r1 Submission January 2012 Jihyun Lee, LG ElectronicsSlide 1 FILS Association Date: Authors: NameAffiliationsAddressPhone .
Doc.: IEEE 802.11-12/0550 Submission NameAffiliationsAddressPhone Kiseon RyuLG Electronics10225 Willow Creek Rd, San Diego, CA, 92131, USA +1

Doc.: IEEE /0550 Submission NameAffiliationsAddressPhone Kiseon RyuLG Electronics10225 Willow Creek Rd, San Diego, CA, 92131, USA +1
Doc.: IEEE 802.11-12/933r6 Submission July 2012 Fang Xie (CMCC)Slide 1 Access Control Mechanism for FILS Date: 2012-07-17 Authors: NameAffiliationsAddressPhoneemail.

Doc.: IEEE /933r6 Submission July 2012 Fang Xie (CMCC)Slide 1 Access Control Mechanism for FILS Date: Authors: NameAffiliationsAddressPhone .
Doc.: IEEE 802.11-12/1042r3 Submission NameAffiliationsAddressPhoneemail Giwon ParkLG Electronics LG R&D Complex 533, Hogye- 1dong, Dongan-Gu, Anyang,

Doc.: IEEE /1042r3 Submission NameAffiliationsAddressPhone Giwon ParkLG Electronics LG R&D Complex 533, Hogye- 1dong, Dongan-Gu, Anyang,
Doc.: IEEE 802.11-12/1042 Submission NameAffiliationsAddressPhoneemail Giwon ParkLG Electronics LG R&D Complex 533, Hogye- 1dong, Dongan-Gu, Anyang, Kyungki,

Doc.: IEEE /1042 Submission NameAffiliationsAddressPhone Giwon ParkLG Electronics LG R&D Complex 533, Hogye- 1dong, Dongan-Gu, Anyang, Kyungki,
Doc.: IEEE 802.11-12/0249r0 Submission March 2012 Slide 1Lin Cai et al,Huawei. Differentiated Association Service Provisioning in WiFi Networks Date: 03/02/2012.

Doc.: IEEE /0249r0 Submission March 2012 Slide 1Lin Cai et al,Huawei. Differentiated Association Service Provisioning in WiFi Networks Date: 03/02/2012.
Doc.: IEEE 802.11-12/1054r0 Submission Sep. 2012 Santosh Pandey (Cisco)Slide 1 FILS Reduced Neighbor Report Date: 2012-09-07 Authors:

Doc.: IEEE /1054r0 Submission Sep Santosh Pandey (Cisco)Slide 1 FILS Reduced Neighbor Report Date: Authors:
Doc.: IEEE 802.11-12/0257r1 Submission NameAffiliationsAddressPhoneemail Giwon ParkLG Electronics LG R&D Complex 533, Hogye- 1dong, Dongan-Gu, Anyang,

Doc.: IEEE /0257r1 Submission NameAffiliationsAddressPhone Giwon ParkLG Electronics LG R&D Complex 533, Hogye- 1dong, Dongan-Gu, Anyang,
Doc.: IEEE 802.11-12/0067r0 Submission Jan 2012 Phillip Barber, HuaweiSlide 1 Active Scanning Time Notification Date: 2012-01-12 Authors: NameAffiliationsAddressPhoneemail.

Doc.: IEEE /0067r0 Submission Jan 2012 Phillip Barber, HuaweiSlide 1 Active Scanning Time Notification Date: Authors: NameAffiliationsAddressPhone .
Submission doc.: IEEE 11-12-0406-00-00ai March 2012 InterDigital, KDDI, Nokia, Huawei, IntelSlide 1 Proposed SFD Text for 802.11ai Passive Scanning Improvement.

Submission doc.: IEEE ai March 2012 InterDigital, KDDI, Nokia, Huawei, IntelSlide 1 Proposed SFD Text for ai Passive Scanning Improvement.
Doc.:IEEE 802.11-12/0259r4 Submission March 2012 Reducing Probe Responses for faster AP discovery Slide 1 Authors: March 2012 NameAffiliationsAddressPhoneemail.

Doc.:IEEE /0259r4 Submission March 2012 Reducing Probe Responses for faster AP discovery Slide 1 Authors: March 2012 NameAffiliationsAddressPhone .
Doc.: IEEE 802.11-12/0897r0 SubmissionJae Seung Lee, ETRISlide 1 Active Scanning considering Operating Status of APs Date: 2012-07-06 July 2012.

Doc.: IEEE /0897r0 SubmissionJae Seung Lee, ETRISlide 1 Active Scanning considering Operating Status of APs Date: July 2012.
Doc.: IEEE 802.11-11/1500-00-00ai Submission Nov 2011 Huawei Technologies Co. LtdSlide 1 Broadcast Probe Response in TGai Date: 2011-11-05 Authors: NameAffiliationsAddressPhoneemail.

Doc.: IEEE / ai Submission Nov 2011 Huawei Technologies Co. LtdSlide 1 Broadcast Probe Response in TGai Date: Authors: NameAffiliationsAddressPhone .
Doc.: IEEE 802.11-12/0061r1 SubmissionJae Seung Lee, ETRISlide 1 Probe Response frame transmission interval Date: 2011-01-12.

Doc.: IEEE /0061r1 SubmissionJae Seung Lee, ETRISlide 1 Probe Response frame transmission interval Date:

Similar presentations

Ads by Google