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Simulation Scenario for OBSS in Home Network

Detailed overview of evaluation scenario for OBSS in home network addressing overlap issues and hidden terminal effects using WLAN technology specifications.

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Simulation Scenario for OBSS in Home Network

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  1. September 2009 Simulation Scenario for OBSS in Home Network Date: 2009-9-22 Authors: Yasushi Takatori (NTT)

  2. Introduction-1 OBSS issue cannot be ignored because 11ac is most likely touse 80MHz band as well as MU-MIMO technology [1][2]. Combination of other technologies with MU-MIMO or modification of MU-MIMO for isolated BSS may enhance robustness for OBSS [3][4]. In this presentation, possible evaluation scenario for OBSS in home network is presented. It may cover most elements of OBSS issue in home network scenario. September 2009 Yasushi Takatori (NTT) Slide 2

  3. Introduction-2 In FR&EM, there is a following statement. It is encouraged that TGac technology proposals describe its impact on OBSS. In the last meeting, TGac agrees on the following statement by Strawpoll. OBSS investigations should be comparable, so the OBSS Note in 09/451 should propose studying OBSS via the Enterprise Simulation Scenario, with the original BSS copy/pasted to (20,40) and (-20,-40) Y34, N0, A30 OBSS in enterprise scenario has been continuously discussed. Our measurement results clarify that more than two overlaps is likely to happen [5]. Simulation scenario for Home Network should be addressed also. September 2009 Yasushi Takatori (NTT) Slide 3

  4. WLAN Market for Home Network in Japan Home (Except for game equipments and built-in chips) Enterprise September 2009 Both Home Network and Enterprise Network are important markets for 11ac. Expected Number of shipments in 2013 1 0.8 Home: AP:4.6 million STA: 8.7 million Enterprise: AP: 2.5 million STA: 5.7 million 0.6 Market Size (billion US$) 0.4 0.2 0 2006 2007 2008 Year Reference (in Japanese): Seed Planning, Inc., http://www.seedplanning.co.jp/press/2009/2009070901.html Yasushi Takatori (NTT) Slide 4

  5. Home Network Evaluation Scenario To simplify OBSS scenario, the following effects are focused on. Overlapping with 11ac Overlapping with 11n Throughput degradation from isolated Home Entertainment scenario Effect of hidden terminals in OBSS Evaluation model BSS #1: Home entertainment scenario / Simplified Home Entertainment scenario BSS #2: 11n using lower 20/40MHz with 2 STAs BSS #3: 11ac using upper 40MHz or entire 80MHz with 2 STAs Room walls are inserted to evaluate effect of hidden terminals September 2009 Yasushi Takatori (NTT) Slide 5

  6. AP AP AP AP September 2009 Evaluation Model BSS #1: Home entertainment scenario/ simplified home entertainment scenario BSS #2: 11n using lower 20/40MHz with 2 STAs STA-1: Video Streaming STA-2: File downloading BSS #3:11ac using upper 40MHz or entire 80MHz with 2 STAs STA-1: Video Streaming STA-2: File downloading 802.11ac AP BSS #1 BSS #2 BSS #3 BSS #1 Yasushi Takatori (NTT) Slide 6

  7. Evaluation of Hidden Terminal Effect September 2009 Attenuation factor at walls: • BSS-k to BSS-k’: TBD • Wall inside a room: TBD • Distance between rooms, d: TBD d d Inside wall Outside wall AP Home Entertainment Scenario / Simplified Home Entertainment Scenario STA STA Yasushi Takatori (NTT) Slide 7

  8. Summary Two OBSSs scenario might be sufficient to evaluate performances in home network because ‘Home Entertainment scenario’ itself is already complicated. The followings are key features of the proposed model. 11n and 11ac are considered for two overlapping BSSs. Room walls insertion enables evaluation of hidden nodes. Future work clarifies important channel characteristics such as DOAs in OBSS. We think that home network simulation scenario should be included in Functional Requirement and Evaluation Methodology document. September 2009 Yasushi Takatori (NTT) Slide 8

  9. References [1] Yasushi Takatori, Importance of Overlapped BSS issue in 802.11ac, IEEE 802.11-09/0630r1, May 15, 2009. [2] Brian Heart, Enterprise Simulation Scenario, IEEE 802.11-09/0816r3, Sept. 08, 2009. [3] Yuichi Morioka, Two Levels of OBSS Controlin .11ac, IEEE802.11-09/0833r0, July 15, 2009. [4] Yasushi Takatori, et. al., Consideration on Interference Management in OBSS, IEEE 802.11-09/0839r2, July 18, 2009. [5] Kentaro Nishimori, et. al., Measurement results for OBSS in home network scenarios, IEEE 802.11-09/1031r0, Sept. 22, 2009. September 2009 Yasushi Takatori (NTT) Slide 9

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