iPhone iOS6 에서의 WiFi 문제와 관련하여
최근 아이폰에서 WIFI 문제를 겪으면서 리퍼도 받아봤습니다만 여전히 어느정도 WIFI문제가 있음을 발견하였습니다. 그래서 계속 조사하던 와중에 다음과 같은 글을 발견하였습니다. 혹시 ipTime 제품군에도 비슷한 문제가 있다면 펌업이 필요해보입니다.
http://www.zdnet.com/a-new-apple-ios-wi-fi-problem-has-popped-up-while-others-remain-unfixed-7000005134/
In the meantime, the problem that iPhone 4S and iPad 3 with their A5 chipsets and iOS 6 had with joining networks has been narrowed down. Research by Christian Rank found that the problem stemmed from a "different interpretation of [the 802.11n] standards: At least the iPhone 4S with iOS 6 sends a parameter "Extended Capabilities" in its association request to the AP. This "Extended Capabilities" parameter has a length of 4. Now, the "IEEE Std 802.11n-2009" states that this parameter should have only 3 as valid length. Contrary to that, the current "IEEE Std 802.11-2012" defines the valid length between 3 and 8. It seems that our HP/H3C equipment treats "Extended Capabilities" parameter length == 4 as fatal error and rejects the association (instead of just ignoring this parameter). From the formal point of view, Apple's implementation is correct, and HP should correct its firmware. We've got in touch with HP about this issue and are now awaiting their response. Nevertheless, I hope that Apple updates iOS 6 that no ‘Extended Capabilities' parameter is sent during association, since its purely redundant."
http://www.zdnet.com/a-new-apple-ios-wi-fi-problem-has-popped-up-while-others-remain-unfixed-7000005134/
In the meantime, the problem that iPhone 4S and iPad 3 with their A5 chipsets and iOS 6 had with joining networks has been narrowed down. Research by Christian Rank found that the problem stemmed from a "different interpretation of [the 802.11n] standards: At least the iPhone 4S with iOS 6 sends a parameter "Extended Capabilities" in its association request to the AP. This "Extended Capabilities" parameter has a length of 4. Now, the "IEEE Std 802.11n-2009" states that this parameter should have only 3 as valid length. Contrary to that, the current "IEEE Std 802.11-2012" defines the valid length between 3 and 8. It seems that our HP/H3C equipment treats "Extended Capabilities" parameter length == 4 as fatal error and rejects the association (instead of just ignoring this parameter). From the formal point of view, Apple's implementation is correct, and HP should correct its firmware. We've got in touch with HP about this issue and are now awaiting their response. Nevertheless, I hope that Apple updates iOS 6 that no ‘Extended Capabilities' parameter is sent during association, since its purely redundant."
