November 2014 doc IEEE 802 11 141437 r
November 2014 doc. : IEEE 802. 11 -14/1437 r 1 Efficient Wider Bandwidth Operation in IEEE 802. 11 ax Date: 2014 -11 -04 Authors: Submission Slide 1 Jinsoo Ahn, Yonsei University
November 2014 doc. : IEEE 802. 11 -14/1437 r 1 Background • 802. 11 ac Wideband Operation – 802. 11 ac based wideband operation supports 20 MHz, 40 MHz, 80 MHz, 160 MHz transmission for single user – AP expands its channel from primary channel, but it is only allowed to expand to predetermined adjacent channel – If one of the 20 MHz channel in secondary channel is busy, AP cannot use other idle channels in secondary channel • 802. 11 ax PAR document – Make more efficient use of spectrum resources in scenarios with a high density of STAs per BSS[1] • More Efficient use pattern of spectrum resources should be discussed Submission Slide 2 Jinsoo Ahn, Yonsei University
November 2014 doc. : IEEE 802. 11 -14/1437 r 1 Prior Works on Wider Bandwidth Operation • Legacy channel access can not utilize resource fully Submission Slide 3 Jinsoo Ahn, Yonsei University
November 2014 doc. : IEEE 802. 11 -14/1437 r 1 Prior Works on Wider Bandwidth Operation • Allowing to use all available Channel with PIFS sensing could enhance channel utilization[2] Submission Slide 4 Jinsoo Ahn, Yonsei University
November 2014 doc. : IEEE 802. 11 -14/1437 r 1 Prior Works on Wider Bandwidth Operation • Examples for 80 MHz (4 Channels)[2] – CH 1 is primary Channel (Colored means busy) CH 1 CH 2 CH 3 Case 1 Using All Available CH busy Case 3 busy Case 4 busy Case 5 Submission Legacy Operation busy Case 2 Case 6 CH 4 Resource utilization busy Slide 5 Jinsoo Ahn, Yonsei University
November 2014 doc. : IEEE 802. 11 -14/1437 r 1 Prior Works on Wider Bandwidth Operation • Previous contributions using new patterns of wider bandwidth provides the enhanced efficiency of wireless LAN system • But there were not enough discussions about HOW to expand adopt new patterns of channel use • Using all available CHs with PIFS sensing on secondary channels could make more contentions and interferences in dense OBSS scenario[3] – Fairness need to be considered Submission Slide 6 Jinsoo Ahn, Yonsei University
November 2014 doc. : IEEE 802. 11 -14/1437 r 1 Alternative Primary Channel based Access Method • Adding to Primary Channel based wideband expansion, adopting other secondary channel based wideband expansion could enhance efficient use of spectrum resources • Alternative Primary Channel(APCH) is the basis channel of new wideband expansion • Channel expansion rule on each primary channel can be the same as conventional 802. 11 ac rule • It allows non-contiguous channel use and new channel use patterns – eg. Contiguous 60 MHz channel, non-contiguous 80 MHz channel, etc. Submission Slide 7 Jinsoo Ahn, Yonsei University
November 2014 doc. : IEEE 802. 11 -14/1437 r 1 Alternative Primary Channel based Access Method • Legacy Pattern Case • Alternative Primary Channel Case Submission Slide 8 Jinsoo Ahn, Yonsei University
November 2014 doc. : IEEE 802. 11 -14/1437 r 1 Alternative Primary Channel based Access Method • Alternative Primary Channel Expansion Rule – Only with Primary Channel • Sustain primary channel based transmission • Alternative primary channel as a new start point of channel expansion is only applicable with primary channel-based access – Allowing transmission without Primary Channel • Although primary channel is busy, alternative primary channel could replace primary channel • New back-off rule need to be considered for alternative primary channel Submission Slide 9 Jinsoo Ahn, Yonsei University
November 2014 doc. : IEEE 802. 11 -14/1437 r 1 Alternative Primary Channel based Access Method • Only with Primary Channel • Allowing transmission without Primary Channel Submission Slide 10 Jinsoo Ahn, Yonsei University
November 2014 doc. : IEEE 802. 11 -14/1437 r 1 Alternative Primary Channel based Access Method • Resource utilization of APCH – CH 1 is primary Channel – CH 3 is APCH Channel (Colored means busy) CH 1 CH 2 CH 3 Case 1 Legacy APCH w/ Primary APCH w/o Primary Busy Case 2 Busy Case 3 Busy Case 4 Busy Case 5 Case 6 CH 4 Resource utilization Busy Submission Slide 11 Jinsoo Ahn, Yonsei University
November 2014 doc. : IEEE 802. 11 -14/1437 r 1 Analysis (Assumptions) • Submission Slide 12 Jinsoo Ahn, Yonsei University
November 2014 doc. : IEEE 802. 11 -14/1437 r 1 Analysis (Example: Legacy vs. APCH) • Legacy Pattern of using 80 MHz • APCH Pattern of using 80 MHz Submission Slide 13 Jinsoo Ahn, Yonsei University
November 2014 doc. : IEEE 802. 11 -14/1437 r 1 Analysis (Parameters) • Submission Slide 14 Jinsoo Ahn, Yonsei University
November 2014 doc. : IEEE 802. 11 -14/1437 r 1 Analysis • Submission Slide 15 Jinsoo Ahn, Yonsei University
November 2014 doc. : IEEE 802. 11 -14/1437 r 1 Analysis • Submission Slide 16 Jinsoo Ahn, Yonsei University
November 2014 doc. : IEEE 802. 11 -14/1437 r 1 Analysis • 54% 39% 90% 52% Submission 99% 39% Slide 17 Jinsoo Ahn, Yonsei University
November 2014 doc. : IEEE 802. 11 -14/1437 r 1 Conclusion • Alternative Primary Channel would increase Channel Usage • Alternative Primary Channel would sustain legacy channel expansion rule, and APCH would contend with other Primary Channel also • APCH based transmission without Primary Channel has much more gain • APCH based wider bandwidth operation might control OBSS fairness on wider bandwidth operation • We need to discuss about specific wider bandwidth channel expansion method on 802. 11 ax Submission Slide 18 Jinsoo Ahn, Yonsei University
November 2014 doc. : IEEE 802. 11 -14/1437 r 1 Reference • [1] IEEE 802. 11 -14/0165 r 1 “ 802. 11 HEW SG Proposed PAR” • [2] IEEE 802. 11 -13/1058 r 0 “Efficient Wider Bandwidth Operation” • [3] IEEE 802. 11 -13/0839 r 1 “Discussion on OFDMA in IEEE 802. 11 ax” Submission Slide 19 Jinsoo Ahn, Yonsei University
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