August 2018 doc.: IEEE 802.15-18-0389-00-004w. Project: IEEE P802.15

August 2018 doc.: IEEE 802.15-18-0389-00-004w. Project: IEEE P802.15

August 2018 doc.: IEEE 802.15-18-0389-00-004w. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [802.15.4w 802.15.4w Fraunhofer IIS proposal simulations update] Date Submitted: [8 August, 2018] Source: [Johannes Wechsler] Company [Fraunhofer Institute for Integrated Circuits IIS] Address [Nordostpark 84, Nuremberg, 90411, Bavaria] Voice:[ +49 911 58061-3334], FAX: [+49 911 58061-3299], E-Mail:[[email protected]] Re: [802.15.4w proposal preview Fraunhofer IIS, IEEE 802.15-18-0310-02-004w] Abstract: [Fraunhofer IIS for 802.15.4w proposal simulations updated according to agreement of last meeting.] Purpose: [Updated Simulation results for the proposed PHY layer for a more interference robust transmission based on the existing LECIM PHY.] Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15. Submissio n

Slide 1 Johannes Wechsler, Fraunhofer IIS August 2018 doc.: IEEE 802.15-18-0389-00-004w. 802.15.4w Fraunhofer IIS proposal simulations update Johannes Wechsler Fraunhofer IIS Submissio n Slide 2 Johannes Wechsler, Fraunhofer IIS August 2018 doc.: IEEE 802.15-18-0389-00-004w. Blocks PHY service data unit (PSDU)

A block can transmit up to 64 bytes PSDU PSDU size limited to 64byte for TSMA mode Memory requirements increase with the lengths of the PSDUs LPWAN applications predominantly use small payloads Optimized for these small payloads PSDUs exceeding 64 byte are fragmented in higher layers Possibly work in existing LECIM Fragmentation (?) Submissio n Slide 3 Johannes Wechsler, Fraunhofer IIS August 2018 doc.: IEEE 802.15-18-0389-00-004w. Simulation models and settings Setup environment from [3] Noise figure = 3 dB Channel models TU0: Typical Urban 0Hz Doppler [4]

TU3: Typical Urban 3Hz Doppler [4] Interference models to test against [3] Outdoor urban, hBS=140m [4] Submissio n Slide 4 Johannes Wechsler, Fraunhofer IIS August 2018 doc.: IEEE 802.15-18-0389-00-004w. Simulation Parameters Additional settings 10.000 packets per point to achieve smooth graphs Updated PSDU size of 37 Bytes 69 Symbols per sub-packet 69 Symbols gap between sub-packets TSMA Time gap 64 symbols to cope with longest interferers of given model

2.0 MHz bandwidth Receiver decodes with realistic channel estimation FEC = 1/3 rate convolutional code Effective data rates include FEC, PHR and SHR Symbol rate (kS/s) 2.38 + 2*Spread 2.38 4.76 19.04 0.29 0.58 1.17 4.66 Eff. data rate (kbit/s) Submissio

n Slide 5 Johannes Wechsler, Fraunhofer IIS August 2018 doc.: IEEE 802.15-18-0389-00-004w. Minimum Required Sensitivity Effective data rate of 0.29 kBit/s achieves required 140 dBm easily at 1% PER AWGN performance not affected by packet length Submissio n Slide 6

Johannes Wechsler, Fraunhofer IIS August 2018 doc.: IEEE 802.15-18-0389-00-004w. Impact of TSMA with FEC (2) no interference transmission at same transmission energy 16 dB gain of proposal compared to uncoded at 1% PER 16 dB Submissio n Minimal impact of larger size of 37B on proposal, ~1dB on non-TSMA Slide 7

Johannes Wechsler, Fraunhofer IIS August 2018 doc.: IEEE 802.15-18-0389-00-004w. Impact of TSMA with FEC (3) interference outdoor urban, h = 140m [4] 29 dB+ gain of proposal compared to uncoded at 1% PER Minimal impact of larger size of 37B on proposal, ~1dB on non-TSMA 29+ dB Submissio n

Slide 8 Johannes Wechsler, Fraunhofer IIS August 2018 doc.: IEEE 802.15-18-0389-00-004w. Interference Robustness (1) Scenario less exposed receiver rural, h = 32m 5.5 dB gain over FEC coded transmission without TSMA at 1% PER Minimal impact of larger size of 37B on proposal, more on non-TSMA Submissio n 5.5 dB

Slide 9 Johannes Wechsler, Fraunhofer IIS August 2018 doc.: IEEE 802.15-18-0389-00-004w. Interference Robustness (2) Required Scenario urban, h = 140m [4] 9 dB gain over FEC coded transmission without TSMA at 1% PER Minimal impact of larger size of 37B on proposal, more on non-TSMA Submissio n 9 dB

Slide 10 Johannes Wechsler, Fraunhofer IIS August 2018 doc.: IEEE 802.15-18-0389-00-004w. References [1] IEEE Std 802.15.4-2015 [2] P802.15.4w PAR [3] 802.15.4w Technical Guidance Document; 12 March, 2018; 1518-0161-00-004w [4] Draft IG LPWA Report; 3 November, 2017; 15-17-0528-01 Submissio n Slide 11 Johannes Wechsler, Fraunhofer IIS

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