May 2015 doc IEEE 802 11 150551 r

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May 2015 doc. : IEEE 802. 11 -15/0551 r 0 OBSS Preamble Detection Evaluation

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 OBSS Preamble Detection Evaluation Date: 2015 -05 -11 Authors: Name Suhwook Kim Wookbong Lee Hyeyoung Choi Jeongki Kim Kiseon Ryu Han. Gyu Cho Submission Affiliations LG Electronics LG Electronics Address 19, Yangjea-daero 11 gil, Seocho-gu, Seoul 137 -130, Korea Slide 1 Phone +82 -2 -6912 -6589 Email suhwook. kim@lge. com wookbong. lee@lge. com hy 0117. choi@lge. com jeongki. kim@lge. com kiseon. ryu@lge. com hg. cho@lge. com Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Abstract • This submission

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Abstract • This submission provides evaluation of OBSS preamble detection using PHY/MAC integrated simulator – We use preamble decoding procedure which is agreed within integrated simulator member – We consider frame type (Data/ACK) and link direction (DL/UL) to analyze OBSS preamble detection probability Submission Slide 2 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Submissions on Preamble Detection

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Submissions on Preamble Detection • 14 -1420 r 1[1], 15 -367 r 0[2] – Evaluate OBSS preamble detection using MAC simulator – OBSS preamble error probability is above 80% Submission Slide 3 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Preamble Error Model Signal

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Preamble Error Model Signal Detect Preamble Error Detect Preamble PPDU • Signal Detect: At the start of preamble, – If the signal strength is above -82 d. Bm, receiver can start to detect the PPDU. [1] – The receiver should be in IDLE status to detect the preamble. – If the receiver is sending/receiving a frame or processing in inter-frame (SIFS), it cannot detect any preamble even though the signal strength is above -82 d. Bm • Preamble Error Detect: At the end of preamble, – In 1420 r 1, if minimum SINR ≤ 0 d. B in preamble duration, then the preamble has errors. Otherwise, the preamble is correct. [1] – But in this submission, we use SINR-PER curve which is addressed from Box 0 calibration with channel model defined in SS document (980 r 10) – Preamble is modeled as 24 bits/symbol (BPSK 1/2) [3] • Preamble of Data frame: L-Part (5 symbols) + VHT-Part (5 symbols) • Preamble of Control frame: L-Part (5 symbols) Submission Slide 4 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Preamble Error Model •

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Preamble Error Model • The receiver will be locked by the first-arrived packet, and later-arrived packets are considered as interference [3] • If preamble passes, the receiver continues to receive the rest part of the packet [3] – If successfully decoding of a MAC frame, defer for NAV; – Otherwise, set CCA to busy for the entire PPDU • If preamble fails, the receiver terminates current reception [3] – The entire PPDU fails – The receiver is unlocked again and then CCA-ED threshold is used to determine if the medium is busy – In this submission, CCA-ED=-62 d. Bm Submission Slide 5 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Simulation Setup [2] Simulator

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Simulation Setup [2] Simulator Type MAC simulator (in 367 r 0) PHY/MAC Integrated simulator Tx Power (AP/STA) 20/15 d. Bm Antenna Gain (AP/STA) 0/-2 d. Bi Traffic Model UL only full buffer (in 367 r 0) DL only, UL only, mixed DL&UL full buffer BSS Bandwidth 80 MHz Noise Figure 0 Noise Floor -101 d. Bm per 20 MHz Rate Control Algorithm Submission single MCS chosen per link to maximize goodput (in 367 r 0) Open Loop Link Adaption [4] MSDU size (bytes) 1476 TXOP size 4 ms Max Retx 10 Simulation Time (sec) 10 PER Curve AWGN(in 367 r 0) addressed from Box 0 calibration Slide 6 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Simulation Setup: modified Scenario

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Simulation Setup: modified Scenario 1 [2] • Same as 15 -367 r 0[2] • 3 channels – Chosen to maximize distance between two apartments one 1 channel. • 5 STAs per AP • 1 antenna per AP & STA Submission Slide 7 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Throughput 5% 50% 90%

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Throughput 5% 50% 90% Mean DL only 0. 67 Mbps 10. 15 Mbps 42. 53 Mbps 16. 08 Mbps UL only 3. 24 Mbps 7. 69 Mbps 27. 33 Mbps 11. 80 Mbps DL (in DL&UL) 1. 08 Mbps 2. 59 Mbps 4. 65 Mbps 2. 82 Mbps UL (in DL&UL) 2. 36 Mbps 5. 74 Mbps 14. 13 Mbps 7. 65 Mbps Slide 8 Suhwook Kim, LG Electronics Submission

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Preamble detection • Nt:

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Preamble detection • Nt: number of total OBSS preambles which has signal strength above -82 d. Bm • Nd: number of detected OBSS preambles – signal strength is over -82 d. Bm & arrived at IDLE status • Ns: number of success decoded OBSS preambles Submission Slide 9 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 OBSS Preamble detection DL

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 OBSS Preamble detection DL only UL only DL & UL Submission Nd / N t Ns / N d Ns / N t DL Data 90. 51% 46. 17% 41. 79% UL ACK 92. 50% 71. 73% 66. 35% UL Data 63. 07% 63. 08% 39. 78% DL ACK 65. 35% 99. 14% 64. 79% DL Data 61. 09% 27. 11% 16. 56% UL ACK 63. 42% 51. 83% 32. 87% UL Data 57. 93% 50. 40% 29. 20% DL ACK 63. 28% 99. 21% 62. 78% Slide 10 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 OBSS Preamble detection per

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 OBSS Preamble detection per BSS Submission Slide 11 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 RSSI of detected OBSS

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 RSSI of detected OBSS preambles • Data Frame Preamble sent by STA Preamble sent by AP Submission Slide 12 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 RSSI of detected OBSS

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 RSSI of detected OBSS preambles • ACK Frame Preamble sent by STA Preamble sent by AP Submission Slide 13 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Effective SINR of detected

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Effective SINR of detected OBSS preambles • Data Frame – Success Maximum SINR of BPSK ½ in MMIB = 9. 1 d. B Preamble sent by AP Preamble sent by STA Submission Slide 14 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Effective SINR of detected

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Effective SINR of detected OBSS preambles • Data Frame – Failed Preamble sent by AP Preamble sent by STA Submission Slide 15 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Effective SINR of detected

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Effective SINR of detected OBSS preambles • ACK Frame – Success Maximum SINR of BPSK ½ in MMIB = 9. 1 d Preamble sent by STA Preamble sent by AP Submission Slide 16 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Effective SINR of detected

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Effective SINR of detected OBSS preambles • ACK Frame – Failed Preamble sent by AP Preamble sent by STA Submission Slide 17 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Simulation Setup: Scenario 3

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Simulation Setup: Scenario 3 • 1 channel – 19 APs operate in one same channel • 30 STAs per AP • 1 antenna per AP & STA • ICD = 30 meter 18 12 17 5 Slide 18 0 4 16 Submission 1 6 11 13 7 8 2 3 10 14 9 15 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Throughput 5% 50% 90%

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Throughput 5% 50% 90% Mean DL only 0. 0 Mbps 0. 50 Mbps 2. 26 Mbps 0. 85 Mbps UL only 0. 0 Mbps 0. 75 Mbps 2. 32 Mbps 1. 02 Mbps DL (in DL&UL) 0. 0 Mbps 0. 32 Mbps 0. 08 Mbps UL (in DL&UL) 0. 0 Mbps 0. 73 Mbps 2. 20 Mbps 0. 98 Mbps Slide 19 Suhwook Kim, LG Electronics Submission

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 OBSS Preamble detection DL

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 OBSS Preamble detection DL only UL only DL & UL Submission Nd / N t Ns / N d Ns / N t DL Data 93. 22% 31. 49% 29. 35% UL ACK 97. 53% 52. 41% 51. 11% UL Data 73. 24% 35. 53% 26. 02% DL ACK 84. 28% 99. 05% 83. 48% DL Data 78. 84% 15. 31% 12. 07% UL ACK 83. 62% 17. 85% 14. 92% UL Data 72. 65% 34. 47% 25. 04% DL ACK 84. 23% 99. 01% 83. 39% Slide 20 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 OBSS Preamble detection per

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 OBSS Preamble detection per BSS Submission Slide 21 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 RSSI of detected OBSS

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 RSSI of detected OBSS preambles • Data Frame Preamble sent by STA Preamble sent by AP Submission Slide 22 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 RSSI of detected OBSS

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 RSSI of detected OBSS preambles • ACK Frame Preamble sent by STA Preamble sent by AP Submission Slide 23 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Effective SINR of detected

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Effective SINR of detected OBSS preambles • Data Frame – Success Maximum SINR of BPSK ½ in MMIB = 9. 1 d. B Preamble sent by AP Preamble sent by STA Submission Slide 24 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Effective SINR of detected

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Effective SINR of detected OBSS preambles • Data Frame – Failed Preamble sent by STA Preamble sent by AP Submission Slide 25 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Effective SINR of detected

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Effective SINR of detected OBSS preambles • ACK Frame – Success Maximum SINR of BPSK ½ in MMIB = 9. 1 d Preamble sent by STA Preamble sent by AP Submission Slide 26 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Effective SINR of detected

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Effective SINR of detected OBSS preambles • ACK Frame – Failed Preamble sent by AP Preamble sent by STA Submission Slide 27 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Conclusion • In this

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Conclusion • In this submission, we evaluate OBSS preamble detection using PHY/MAC integrated simulator – We ran the simulations in modified residential scenario and indoor small BSS scenario – We observed following trends • Preamble error prob. of Data frame is HIGHER than ACK frame • Preamble error prob. of DL Data frame is HIGHER than UL Data frame • On the other hand, preamble error prob. of DL ACK frame is LOWER than UL ACK frame • Preamble error prob. is generally higher in mixed DL&UL traffic model • Preamble of DL ACK is almost decoded successfully (~99%) Submission Slide 28 Suhwook Kim, LG Electronics

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Reference • [1] 11

May 2015 doc. : IEEE 802. 11 -15/0551 r 0 Reference • [1] 11 -14/1420 r 1 The Impact of Preamble Error on MAC System Performance • [2] 11 -15/0367 r 0 OBSS Preamble Detection • [3] 11 -14/1523 r 5 Offline Discussion Minutes of SLS Calibration • [4] 11 -14/620 r 0 link adaptation for PHY SLS calibration Submission Slide 29 Suhwook Kim, LG Electronics