OFDMA performance in 11ax March 2016 OFDMA performance in 11ax Date: 2016-03-14 Authors: Name Affiliations Address Phone Email Suhwook Kim LG Electronics 19, Yangjea-daero 11gil, Seocho-gu, Seoul 137-130, Korea +82-2-6912-6589 suhwook.kim@lge.com Hyunhee Park Hyunh.park@lge.com Jeongki Kim jeongki.kim@lge.com Kiseon Ryu kiseon.ryu@lge.com HanGyu Cho hg.cho@lge.com Suhwook Kim, LG Electronics

Month Year doc.: IEEE 802.11-yy/xxxxr0 March 2016 Introduction In January, we addressed OFDMA performance when we use simple MU-RTS/CTS and CCA after trigger frame RTS/CTS is more powerful in many STAs case and legacy cases Nevertheless, OFDMA shows better throughput This presentation provides update on it Suhwook Kim, LG Electronics John Doe, Some Company

Simulation update MU-RTS/CTS Preamble detection of STA side March 2016 Simulation update MU-RTS/CTS We evaluate MU-RTS/CTS scheme which are defined in our SFD Preamble detection of STA side A STA can detect multiple preambles on different channel BSS channelization Channelization of each BSS can be different Suhwook Kim, LG Electronics

Simulation Setup: Scheduler March 2016 Simulation Setup: Scheduler Scheduling resource Maximum allocation per one station is 1 RU 1 RU: 242-tone (total 4 RUs in 80 MHz) Scheduling policy Random: AP selects STAs randomly In DL case, primary destination is fixed (Head of AP’s queue) frame length is determined by A-MPDU length to primary destination (legacy spec rule) Suhwook Kim, LG Electronics

MU-RTS/CTS in DL-OFDMA March 2016 MU-RTS/CTS in DL-OFDMA We evaluate two MU-RTS/CTS schemes Simple MU-RTS/CTS STAs can transmit CTS frame on secondary channel only SFD MU-RTS/CTS [1] Primary channel should be included when STAs transmit CTS frame Suhwook Kim, LG Electronics

MU-RTS/CTS in DL-OFDMA March 2016 MU-RTS/CTS in DL-OFDMA Simple MU-RTS/CTS Suhwook Kim, LG Electronics

MU-RTS/CTS in DL-OFDMA March 2016 MU-RTS/CTS in DL-OFDMA SFD MU-RTS/CTS Suhwook Kim, LG Electronics

Simulation Setup: Parameters March 2016 Simulation Setup: Parameters Simulator Type PHY/MAC Integrated simulator Tx Power (AP/STA) 20/15 dBm (Topology 3) Antenna Gain (AP/STA) 0/-2 dBi Traffic Model DL and UL mixed (CBR) BSS Bandwidth 80MHz Noise Figure Noise Floor -101dBm per 20MHz Rate Control Algorithm Open Loop Link Adaption [3] MSDU size (bytes) 1472 Feedback GENIE Max Retx 10 Symbol length 4 usec (legacy), 16usec (OFDMA) Metrics Throughput Queue Size AP: 1000 * # of associated STA, STA: 1000 Suhwook Kim, LG Electronics

Topology Topology description Simulation setting March 2016 Topology Topology description 20 APs (Fixed location: center of room) 4 or 20 STAs per one AP (Random location) Simulation setting Open Loop Link Adaption [3] Channelization: Fixed channel Trigger frame is generated every 10 msec period and trigger frame has priority over data frame CH1 CH2 CH3 Suhwook Kim, LG Electronics

March 2016 Simulation cases Case 1: BSS channelization is fixed (all channelization 1) Case 1-1: 4 STAs, DL/UL 50 Mbps Case 1-2: 20 STAs, DL/UL 4 Mbps Case 2: BSS channelization is random (1 or 2) 2-1: 4 STAs, DL/UL 50 Mbps 2-2: 20 STAs, DL/UL 50 Mbps Suhwook Kim, LG Electronics

Simulation Result – Case 1 Month Year doc.: IEEE 802.11-yy/xxxxr0 March 2016 Simulation Result – Case 1 Case 1-1: 4 STAs, DL/UL 50 Mbps Suhwook Kim, LG Electronics John Doe, Some Company

Simulation Result – Case 1 Month Year doc.: IEEE 802.11-yy/xxxxr0 March 2016 Simulation Result – Case 1 Case 1-2: 20 STAs, DL/UL 4 Mbps Suhwook Kim, LG Electronics John Doe, Some Company

Simulation Result – Case 1 Month Year doc.: IEEE 802.11-yy/xxxxr0 March 2016 Simulation Result – Case 1 Throughput comparison PER Tput [Mbps] NO RTS/CTS RTS/CTS-Simple RTS/CTS-SFD 4 STAs DL 74.93 74.05 74.59 UL 122.76 115.12 114.96 SUM 197.69 189.18 189.55 20 STAs 58.38 63.84 63.50 77.65 76.61 75.92 136.03 140.45 139.42 PER [%] NO RTS/CTS RTS/CTS-Simple RTS/CTS-SFD 4 STAs DL 13.67 8.56 9.04 UL 7.17 6.08 6.15 20 STAs 16.08 11.03 11.20 8.83 7.85 7.88 Suhwook Kim, LG Electronics John Doe, Some Company

Simulation Result – Case 2 Month Year doc.: IEEE 802.11-yy/xxxxr0 March 2016 Simulation Result – Case 2 2-1: 4 STAs, DL/UL 50 Mbps Suhwook Kim, LG Electronics John Doe, Some Company

Simulation Result – Case 2 Month Year doc.: IEEE 802.11-yy/xxxxr0 March 2016 Simulation Result – Case 2 2-2: 20 STAs, DL/UL 50 Mbps Suhwook Kim, LG Electronics John Doe, Some Company

Simulation Result – Case 2 Month Year doc.: IEEE 802.11-yy/xxxxr0 March 2016 Simulation Result – Case 2 Throughput comparison PER 　Tput [Mbps] NO RTS/CTS RTS/CTS-Simple RTS/CTS-SFD 4 STAs DL 69.83 73.73 72.54 UL 121.73 114.61 114.95 SUM 191.56 188.33 187.49 20 STAs 71.02 70.99 71.64 124.55 116.28 117.18 195.57 187.28 188.82 PER [%] NO RTS/CTS RTS/CTS-Simple RTS/CTS-SFD 4 STAs DL 13.70 9.68 9.01 UL 7.10 6.55 6.03 20 STAs 13.66 10.48 10.25 7.02 6.39 6.40 Suhwook Kim, LG Electronics John Doe, Some Company

Discussion RTS/CTS could not show better throughput in OFDMA March 2016 Discussion RTS/CTS could not show better throughput in OFDMA PER of OFDMA is around 5 ~ 15 % even through RTS/CTS is not used. The reasons are Reduced contending Frequency diversity So, a room for throughput enhancement by RTS/CTS is limited Because of the situation, RTS/CTS-Simple and RTS/CTS-SFD couldn’t have different performance We will evaluate RTS/CTS performance in following environments to verify our discussion OFDMA with uplink EDCA contending Dense AP Suhwook Kim, LG Electronics

Next Step Following items will be added to OFDMA simulation RTS/CTS March 2016 Next Step Following items will be added to OFDMA simulation RTS/CTS OFDMA with uplink EDCA contending Dense AP Feedback modeling Sophisticated schedulers Different scenarios/traffic model Suhwook Kim, LG Electronics

March 2016 Conclusion We addressed OFDMA performance when we use MU-RTS/CTS which are defined in SFD We evaluated three cases NO RTS/CTS RTS/CTS-Simple RTS/CTS-SFD However, No RTS/CTS, RTS/CTS-Simple, and RTS/CTS-SFD show very similar performance Suhwook Kim, LG Electronics

Reference [1] 11-15/0132r15 Spec Framework March 2016 Reference [1] 11-15/0132r15 Spec Framework [2] 11-14/0980r14 Simulation Scenarios [3] 11-14/620r0 link adaptation for PHY SLS calibration [4] 11-14/0571r10 11ax Evaluation Methodology Suhwook Kim, LG Electronics