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Efficiency Enhancement through Resource Utilization in OBSS Environment

Explore increasing spectrum efficiency and area throughput in OBSS environment focusing on legacy NAV protection issues and solutions for efficient resource utilization.

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Efficiency Enhancement through Resource Utilization in OBSS Environment

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  1. Enhancement on resource utilization in OBSS environment Date: 2013-09-16 Authors: Giwon Park, LG Electronics

  2. Abstract • Main goal of HEW is to increase spectrum efficiency and area throughput [1]. • This presentation introduces efficiency enhancement by resource utilization in OBSS environment. Slide 2 Giwon Park, LG Electronics

  3. Problem Statement: Legacy NAV Protection • NAV protection does not allow AP2 to transmit data to the STA2 when AP 2 receiving RTS first and receiving either CTS or the following data. Slide 3 Giwon Park, LG Electronics

  4. Problem Statement: Legacy NAV Protection • AP2 is allowed to reset NAV and transmit data when receiving RTS first but receiving neither CTS nor the following data (refer to IEEE802.11-2012 section 9.3.2.4) Slide 4 Giwon Park, LG Electronics

  5. Consideration on enhancement • Legacy NAV protection overkills efficiency • Always when receiving RTS, NAV does not allow transmission • No consideration on topologies and scenarios • Question: “In which topologies and scenarios, NAV protection can be relaxed to enhance efficiency?” • A possible approach for enhancement • IfBSS overhears RTS from other BSS, not CTS, BSS is allowed to reuse resource of other BSS’s TXOP. Slide 5 Giwon Park, LG Electronics

  6. Classification on possible cases • Scenarios • BSS1 holds a TXOP first, and BSS2 is to reuse the TXOP • BSS2 should not make an impact on the BSS1 hold a TXOP first. • Four Cases • Based on four possible topologies Slide 6 Giwon Park, LG Electronics

  7. Case I: BSS1 DL / BSS2 UL • Un-manageable hidden node problem to BSS1 • CTS of AP2 collides with STA1’s receiving data. Slide 7 Giwon Park, LG Electronics

  8. Case II: BSS1 DL / BSS2 DL • Un-manageable hidden node problem to BSS1 • RTS of AP2 collides with STA1’s receiving data. Slide 8 Giwon Park, LG Electronics

  9. Case III: BSS1 UL / BSS2 UL • Tolerable interference from BSS1 • BSS2 can reuse TXOP of BSS1 if AP2 receives STA2 RTS Slide 9 Giwon Park, LG Electronics

  10. Case IV: BSS1 UL / BSS2 DL • Tolerable interference from BSS1 • BSS2 can reuse TXOP of BSS1 if AP2 receives STA2 CTS Slide 10 Giwon Park, LG Electronics

  11. Conclusion • This contribution studied on resource utilization in OBSS environment. • Following enhancement points were observed: • one BSS can not reuse TXOP of the other BSS if one yields unmanageable interference to the other (Cases I, II). • one BSS can reuse TXOP of the other BSS if one can endure interference from the other (Cases III, IV). • A possible approach to enhance efficiency • IfBSS overhears RTS, not CTS, BSS is allowed to reuse resource • Need to study about detailed procedures and conditions. Slide 11 Giwon Park, LG Electronics

  12. References [1] 11-13-0339-10-0wng-high-efficiency-wlan-straw-poll [2] IEEE P802.11-REVmcTM/D1.5, June 2013 [3] 11-05-0065-00-000s-on-hidden-and-exposed-terminal-problems Giwon Park, LG Electronics

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