doc.: IEEE /0551r1 SubmissionSuhwook Kim, LG ElectronicsSlide 1 OBSS Preamble Detection Evaluation Date: Authors: NameAffiliationsAddressPhone Suhwook KimLG Electronics 19, Yangjea-daero 11gil, Seocho-gu, Seoul , Korea Wookbong LeeLG Hyeyoung ChoiLG Jeongki KimLG Kiseon RyuLG HanGyu ChoLG May 2015

doc.: IEEE /0551r1 Submission 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 Suhwook Kim, LG ElectronicsSlide 2 May 2015

doc.: IEEE /0551r1 Submission Submissions on Preamble Detection r1[1], r0[2] –Evaluate OBSS preamble detection using MAC simulator –OBSS preamble error probability is above 80% Suhwook Kim, LG ElectronicsSlide 3 May 2015

doc.: IEEE /0551r1 Submission Preamble Error Model Suhwook Kim, LG ElectronicsSlide 4 Signal DetectPreamble Error Detect Preamble PPDU Signal Detect: At the start of preamble, –If the signal strength is above -82 dBm, 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 dBm Preamble Error Detect: At the end of preamble, –In 1420r1, if minimum SINR ≤ 0 dB 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 (980r10) –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) May 2015

doc.: IEEE /0551r1 Submission 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 dBm Suhwook Kim, LG ElectronicsSlide 5 May 2015

doc.: IEEE /0551r1 Submission Simulation Setup [2] Suhwook Kim, LG ElectronicsSlide 6 Simulator Type MAC simulator (in 367r0) PHY/MAC Integrated simulator Tx Power (AP/STA) 20/15dBm Antenna Gain (AP/STA) 0/-2 dBi Traffic Model UL only full buffer (in 367r0) DL only, UL only, mixed DL&UL full buffer BSS Bandwidth 80MHz Noise Figure 0 Noise Floor -101dBm per 20MHz Rate Control Algorithm single MCS chosen per link to maximize goodput (in 367r0) Open Loop Link Adaption [4] MSDU size (bytes) 1476 TXOP size 4 ms Max Retx 10 Simulation Time (sec) 10 PER Curve AWGN(in 367r0) addressed from Box 0 calibration May 2015

doc.: IEEE /0551r1 Submission Simulation Setup: modified Scenario 1 [2] Suhwook Kim, LG ElectronicsSlide 7 Same as r0[2] 3 channels –Chosen to maximize distance between two apartments one 1 channel. 5 STAs per AP 1 antenna per AP & STA May 2015

doc.: IEEE /0551r1 Submission Throughput Suhwook Kim, LG ElectronicsSlide 8 5%50%90%Mean DL only0.67 Mbps10.15 Mbps42.53 Mbps16.08 Mbps UL only3.24 Mbps7.69 Mbps27.33 Mbps11.80 Mbps DL (in DL&UL)1.08 Mbps2.59 Mbps4.65 Mbps2.82 Mbps UL (in DL&UL)2.36 Mbps5.74 Mbps14.13 Mbps7.65 Mbps May 2015

doc.: IEEE /0551r1 Submission Preamble detection N t : number of total OBSS preambles which has signal strength above -82 dBm N d : number of detected OBSS preambles –signal strength is over -82 dBm & arrived at IDLE status N s : number of success decoded OBSS preambles Suhwook Kim, LG ElectronicsSlide 9 May 2015

doc.: IEEE /0551r1 Submission OBSS Preamble detection Suhwook Kim, LG ElectronicsSlide 10 May 2015 N d / N t N s / N d N s / N t DL only DL Data90.51%46.17%41.79% UL ACK92.50%71.73%66.35% UL only UL Data 63.07%63.08%39.78% DL ACK 65.35%99.14%64.79% DL & UL 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%

doc.: IEEE /0551r1 Submission OBSS Preamble detection per BSS Suhwook Kim, LG ElectronicsSlide 11 May 2015

doc.: IEEE /0551r1 Submission Data Frame RSSI of detected OBSS preambles Suhwook Kim, LG ElectronicsSlide 12 May 2015 Preamble sent by AP Preamble sent by STA

doc.: IEEE /0551r1 Submission RSSI of detected OBSS preambles Suhwook Kim, LG ElectronicsSlide 13 May 2015 Preamble sent by AP Preamble sent by STA ACK Frame

doc.: IEEE /0551r1 Submission Effective SINR of detected OBSS preambles Data Frame – Success Suhwook Kim, LG ElectronicsSlide 14 May 2015 Maximum SINR of BPSK ½ in RBIR = 9.1 dB Preamble sent by AP Preamble sent by STA

doc.: IEEE /0551r1 Submission Effective SINR of detected OBSS preambles Data Frame – Failed Suhwook Kim, LG ElectronicsSlide 15 May 2015 Preamble sent by AP Preamble sent by STA

doc.: IEEE /0551r1 Submission ACK Frame – Success Effective SINR of detected OBSS preambles Suhwook Kim, LG ElectronicsSlide 16 May 2015 Maximum SINR of BPSK ½ in RBIR = 9.1 dB Preamble sent by AP Preamble sent by STA

doc.: IEEE /0551r1 Submission Effective SINR of detected OBSS preambles ACK Frame – Failed Suhwook Kim, LG ElectronicsSlide 17 May 2015 Preamble sent by AP Preamble sent by STA

doc.: IEEE /0551r1 Submission 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 Suhwook Kim, LG ElectronicsSlide 18 May

doc.: IEEE /0551r1 Submission Throughput Suhwook Kim, LG ElectronicsSlide 19 5%50%90%Mean DL only0.0 Mbps0.50 Mbps2.26 Mbps0.85 Mbps UL only0.0 Mbps0.75 Mbps2.32 Mbps1.02 Mbps DL (in DL&UL)0.0 Mbps 0.32 Mbps0.08 Mbps UL (in DL&UL)0.0 Mbps0.73 Mbps2.20 Mbps0.98 Mbps May 2015

doc.: IEEE /0551r1 Submission OBSS Preamble detection Suhwook Kim, LG ElectronicsSlide 20 May 2015 N d / N t N s / N d N s / N t DL only DL Data 93.22%31.49%29.35% UL ACK 97.53%52.41%51.11% UL only UL Data 73.24%35.53%26.02% DL ACK 84.28%99.05%83.48% DL & UL DL Data78.84%15.31%12.07% UL ACK83.62%17.85%14.92% UL Data72.65%34.47%25.04% DL ACK84.23%99.01%83.39%

doc.: IEEE /0551r1 Submission OBSS Preamble detection per BSS Suhwook Kim, LG ElectronicsSlide 21 May 2015

doc.: IEEE /0551r1 Submission Data Frame RSSI of detected OBSS preambles Suhwook Kim, LG ElectronicsSlide 22 May 2015 Preamble sent by AP Preamble sent by STA

doc.: IEEE /0551r1 Submission ACK Frame RSSI of detected OBSS preambles Suhwook Kim, LG ElectronicsSlide 23 May 2015 Preamble sent by AP Preamble sent by STA

doc.: IEEE /0551r1 Submission Data Frame – Success Effective SINR of detected OBSS preambles Suhwook Kim, LG ElectronicsSlide 24 May 2015 Maximum SINR of BPSK ½ in RBIR = 9.1 dB Preamble sent by AP Preamble sent by STA

doc.: IEEE /0551r1 Submission Effective SINR of detected OBSS preambles Data Frame – Failed Suhwook Kim, LG ElectronicsSlide 25 May 2015 Preamble sent by AP Preamble sent by STA

doc.: IEEE /0551r1 Submission ACK Frame – Success Effective SINR of detected OBSS preambles Suhwook Kim, LG ElectronicsSlide 26 May 2015 Maximum SINR of BPSK ½ in RBIR = 9.1 dB Preamble sent by AP Preamble sent by STA

doc.: IEEE /0551r1 Submission Effective SINR of detected OBSS preambles ACK Frame – Failed Suhwook Kim, LG ElectronicsSlide 27 May 2015 Preamble sent by AP Preamble sent by STA

doc.: IEEE /0551r1 Submission 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%) Suhwook Kim, LG ElectronicsSlide 28 May 2015

doc.: IEEE /0551r1 Submission Reference [1] 11-14/1420r1 The Impact of Preamble Error on MAC System Performance [2] 11-15/0367r0 OBSS Preamble Detection [3] 11-14/1523r5 Offline Discussion Minutes of SLS Calibration [4] 11-14/620r0 link adaptation for PHY SLS calibration Suhwook Kim, LG ElectronicsSlide 29 May 2015