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Doc.: IEEE 802.11-11/0167r0 Submission May 2011 Jihyun Lee, LG ElectronicsSlide 1 Comments on 238r13 Date: 2011-05-02 Authors: NameAffiliationsAddressPhoneemail.

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Presentation on theme: "Doc.: IEEE 802.11-11/0167r0 Submission May 2011 Jihyun Lee, LG ElectronicsSlide 1 Comments on 238r13 Date: 2011-05-02 Authors: NameAffiliationsAddressPhoneemail."— Presentation transcript:

1 doc.: IEEE 802.11-11/0167r0 Submission May 2011 Jihyun Lee, LG ElectronicsSlide 1 Comments on 238r13 Date: 2011-05-02 Authors: NameAffiliationsAddressPhoneemail Jihyun LeeLG ElectronicsLG R&D Complex 533, Hogye-1dong, Dongan-Gu, Anyang, Kyungki, 431-749, Korea +82-31-450- 1860 Jihyun1220.lee@lge.com Eunsun Kim Yongho Seok

2 doc.: IEEE 802.11-11/0167r0 Submission Abstract This presentation contains comments on “11-11-0238- 13-00ai-use-case-reference-list-for-TGai” May 2011 Jihyun Lee, LG ElectronicsSlide 2

3 doc.: IEEE 802.11-11/0167r0 Submission Correction of expected values according to the description of the traits Tokyo Central Train Station: –Mobile devices perform Internet access while entering or leaving a very crowded train station. There is the possibility of the person running, not just walking. Another\ example of this this kind of crowding is the Marathon scenario, where there are more than a thousand participants moving through a city and associating with numerous, uncoordinated hotspots –For a pedestrian case, coverage interval value of less than 10 sec. does not seem quite feasible Does everyone run as fast as Usain Bolt? His 100m world record is 9.72 sec… –Due to unexpected pedestrian route choice, more than 2 sec. seems more reasonable May 2011 Jihyun Lee, LG ElectronicsSlide 3 TraitExpected ValueDifficulty designation Link-Attempt Rate100s/secondHigh Media Load50%High Coverage IntervalLess than 10 sec More than 2 sec Med Low to medium Link Setup Time100 msHigh

4 doc.: IEEE 802.11-11/0167r0 Submission Correction of expected values according to the description of the traits Station arrival –A train with no Wi-Fi access arrives at a station and the passengers want to connect to the AP. A small number (less than 25%) of the passengers will remain in the AP range when the train leaves, 90 seconds after arrival. –According to the definition of coverage interval, the expected value of coverage interval should be more than 10 sec., 90 sec in this particular scenario. –I do not see any difference from Passenger in-transit case. Link setup time should be less than 2 sec. possibly 100ms May 2011 Jihyun Lee, LG ElectronicsSlide 4 TraitExpected ValueDifficulty designation Link-Attempt Rate100sHigh Media Load50+High Coverage Interval10 seconds 90 secondsLow Link Setup TimeMore than 2 sec Less than 2 sec Low Medium to high

5 doc.: IEEE 802.11-11/0167r0 Submission Correction of expected values according to the description of the traits Passenger In-transit access –The train is a mobile AP which the passengers connect to whilst travelling. The turnover of STAs accessing the AP will be about 25% every 3 to 5 minutes. Users will not log off when leaving the train. –According to the definition of coverage interval, the expected value of coverage interval should be more than 10 sec., 3 to 5 minutes in this particular scenario. May 2011 Jihyun Lee, LG ElectronicsSlide 5 TraitExpected ValueDifficulty designation Link-Attempt Rate100sHigh Media Load50+High Coverage Interval10 sec more than 3 to 5 min Low Link Setup Time100 msHigh

6 doc.: IEEE 802.11-11/0167r0 Submission Correction of expected values according to the description of the traits Station Lobby –STAs will arrive in a fairly constant rate and want instant access to schedules, status, and optimal transit routes. The transactions may include ticket purchase. –Same as Tokyo Central Train Station case, coverage interval less than 10 sec. seems infeasible. May 2011 Jihyun Lee, LG ElectronicsSlide 6 TraitExpected ValueDifficulty designation Link-Attempt Rate100s/secondHigh Media Load50%High Coverage IntervalLess than 10 sec More than 2 sec Med Low to medium Link Setup Time100 msHigh

7 doc.: IEEE 802.11-11/0167r0 Submission Expected values of use case traits Link setup time –Vague definition the amount time required to establish for the first time a link to an AP within an ESS It is not clear if this means average link setup time or maximum tolerable link setup time for a STA –It is not clear how to estimate or calculate expected value of link setup time Coverage interval –Vague definition The time the STA is within the range of an AP within an ESS It is not clear if it includes hand-off time within an ESS –It is not clear how to estimate expected value of coverage interval May 2011 Jihyun Lee, LG ElectronicsSlide 7

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