1 / 11

Measurement results for OBSS in home network scenarios

Measurement results for OBSS in home network scenarios. Authors:. Date: 2009-9-22. Abstract. OBSS issue is important in TGac because frequency channel shortage is expected [1, 2].

gustav
Download Presentation

Measurement results for OBSS in home network scenarios

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Measurement results for OBSS in home network scenarios Authors: Date: 2009-9-22 K.Nishimori, T. Murakami, R.Kudo, Y.Takatori, Y.Asai (NTT)

  2. Abstract • OBSS issue is important in TGac because frequency channel shortage is expected [1, 2]. • In Ref [3], the OBSS effect in apartment model is discussed using empirical path-loss formula in TGn channel model. • In this document, we show the measurement results of OBSS effect in a typical Japanese apartment. • From the measurement results, we confirm that it is important to consider OBSS effect in home network scenarios for 11ac system design. K.Nishimori, T. Murakami, R.Kudo, Y.Takatori, Y.Asai (NTT)

  3. Measurement place 3.0 m 6 7.3 m 1 2 3 4 5 7 K.Nishimori, T. Murakami, R.Kudo, Y.Takatori, Y.Asai (NTT)

  4. Layout of each room in the measurement place 7.3 m 1 S2 S1 S5 3.0 m S3 S4 2 S * APNumber of antennas = 8, Linear array (Spacing 0.5λ) STANumber of antennas = 4, Linear array (Spacing 0.5λ) Measurement K.Nishimori, T. Murakami, R.Kudo, Y.Takatori, Y.Asai (NTT)

  5. D/A D/A D/A D/A Measurement equipment • 4x8 MIMO channel measurement was carried out for SDMA evaluation. • Long preamble signal is continuously transmitted. • Interference between two APs or AP/STA is assumed in this measurement. Tx (STA) : 4 element h = 2.12/0.9, 0.75 m Rx (AP) : 8 element h = 2.12 m AGC LNA Up-conv. Down-conv. HPA A/D AGC LNA Up-conv. Down-conv. HPA A/D AGC Up-conv. LNA Down-conv. HPA A/D Up-conv. HPA AGC LNA Down-conv. A/D Preamble generator MT Channel estimator TCP-IP TCP-IP K.Nishimori, T. Murakami, R.Kudo, Y.Takatori, Y.Asai (NTT)

  6. AP AP STA Image of interference from OBSS (other person’s room) (my room) (desired) (OBSS) Measured path STA (OBSS) (desired) K.Nishimori, T. Murakami, R.Kudo, Y.Takatori, Y.Asai (NTT)

  7. Measurement parameters • Frequency 4.85 GHz • Bandwidth 40 MHz (20MHz x 2) • Signal OFDM signal • Number of FFT 128 • Number of subcarrier 96 (Legacy .11a mode) • Antenna height 2.12 m (Rx side) • 0.75m (Tx side) K.Nishimori, T. Murakami, R.Kudo, Y.Takatori, Y.Asai (NTT)

  8. AP AP Results on Interference power ~ Horizontal neighborhood rooms~ (Case 1) (Case 1) [dBm] 3m -74.46 -76.54 -68.28 -69.18 -64.63 -63.52 -56.89 -56.23 -50.18 -45.79 Averaged. height = 2.12 m (Case 2) (Case 2) [dBm] -78.61 -69.98 -65.73 -55.57 -41.39 3m height = 0.9 m K.Nishimori, T. Murakami, R.Kudo, Y.Takatori, Y.Asai (NTT)

  9. -22 -32 -42 -52 -62 -72 -82 -92 TGn Model [3] Measurement Result Measurement result agrees with the path-loss model in TGn [3]. Relative Received Power [dB] Indoor propagation loss formula (11n) *, F in MHz, d in feet For d<16.5ft Lp = – 38 + 20 log F + 20 log d + Wall/Floor loss (Free Space formula) For d>16.5ft Lp = – 38 + 20 log F + 20 log 16.5 + 35 log (d/16.5) + Wall/Floor Loss K.Nishimori, T. Murakami, R.Kudo, Y.Takatori, Y.Asai (NTT)

  10. Summary • When considering the interference betweens rooms on • horizontal direction, interference seems to be almost same • with the TGn model.[3] Hence, the model in TGn seems • to be reasonable in the evaluation of OBSS in the apartment. • As well as described in [3], this result shows the influence on • the interference by OBSSs is serious problem in apartment. • TGac should consider and establish some scenarios to evaluate • the influence of OBSS interference. K.Nishimori, T. Murakami, R.Kudo, Y.Takatori, Y.Asai (NTT)

  11. References [1] Yuichi Morioka, “Two Levels of OBSS Control in .11ac,” Doc. IEEE802.11-09/0833r0. [2] Brian Hart et al., “Enterprise Simulation Scenario,” Doc. IEEE802.11-09/0816r2. [3] Graham Smith, “Overlapping BSS Analysis of Channel Requirements,” Doc. IEEE802.11-08/1470-02-00aa. K.Nishimori, T. Murakami, R.Kudo, Y.Takatori, Y.Asai (NTT)

More Related