Mar. 2018 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Draft PAR & CSD Comment Responses] Date Submitted: [8 March, 2018] Source: [Joerg ROBERT] Company [Friedrich-Alexander University Erlangen-Nuernberg] Address [Am Wolfsmantel 33, 91058 Erlangen, Germany] Voice:[+49 9131 8525373], FAX: [+49 9131 8525102], E-Mail:[joerg.robert@fau.de] Re: [] Abstract: [Comment resolution to comments on 802.15.4w PAR & CSD] Purpose: [Information to 802 EC] 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. Joerg ROBERT, FAU Erlangen-Nuernberg

Draft 802.15.4w PAR & CSD Comment Responses Mar. 2018 Draft 802.15.4w PAR & CSD Comment Responses Joerg ROBERT (FAU Erlangen-Nuernberg), chair SG 802.15.4w Joerg Robert, FAU Erlangen-Nuernberg

In response to the comments from James Gilb Mar. 2018 In response to the comments from James Gilb Joerg Robert, FAU Erlangen-Nuernberg

Mar. 2018 PAR 5.2b Comment: Add the anticipated range that this new PHY will provide Text in PAR/CSD: This amendment defines a Low Power Wide Area Network (LPWAN) extension to the IEEE Std. 802.15.4 LECIM PHY layer to cover network cell radii of typically 10-15km in rural areas and deep in-building penetration in urban areas. Remarks / Answers to the Comments: Accept: Added text to anticipate the range of typical LPWAN networks. Joerg Robert, FAU Erlangen-Nuernberg

PAR 5.2b cont’d Comment: Delete "as needed“ Text in PAR/CSD: Mar. 2018 PAR 5.2b cont’d Comment: Delete "as needed“ Text in PAR/CSD: Modifications to the Medium Access Control (MAC) layer, needed to support this PHY extension, are defined as needed. Remarks / Answers to the Comments: Accept: “as needed” is deleted as suggested. Joerg Robert, FAU Erlangen-Nuernberg

Mar. 2018 PAR 5.5 Comment: The text says that high link margin is required for interferers, but doesn't put a value on "high". What is high and why don't current PHYs in 802.15.4 meet it? Text in PAR/CSD: Remarks / Answers to the Comments: TODO: Unprecise formulation. Why link margin for interferers Joerg Robert, FAU Erlangen-Nuernberg

Mar. 2018 PAR 5.5 cont’d Comment: 140 dBm sensitivity implies -174 dBm/Hz + 10 dB SNR and NF gives -164 dBm/Hz, leaving only 24 dB for BW, or 251 Hz. That would likely give < 1 kb/s, which doesn't work for IoT. From where does this -140 dBm come? Text in PAR/CSD: Remarks / Answers to the Comments: TODO: Mention lower SNR that is achievable. 1 kb/s is achievable and sufficient for many applications, as cell load may be higher. Joerg Robert, FAU Erlangen-Nuernberg

Mar. 2018 PAR 5.5 cont’d Comment: “The end result is the inability to guarantee the required transmission reliability in such scenarios." Wireless networks can never "guarantee the required transmission reliability" and this project won't change that fact. Text in PAR/CSD: The end result is the inability to achieve guarantee the required transmission reliability in such scenarios. This amendment is needed to close this gap and to provide interference robust reliable transmission at receiver sensitivities of -140dBm while delivering multiyear battery life. Remarks / Answers to the Comments: Accept: “Guarantee” and “reliable” are removed. Joerg Robert, FAU Erlangen-Nuernberg

Mar. 2018 PAR 5.5 cont’d Comment: "receiver sensitivities of -140dBm while delivering multiyear battery life." 802.15.4 already provides multi-year battery life with the existing PHYs. There does not appear to be anything proposed with the amendment that would improve battery life. In fact, by spreading the information over a longer period of time, the receiver would be on longer, using more power, not less. Text in PAR/CSD: Remarks / Answers to the Comments: TODO: The robustness against interference is increased, which requires less re-transmissions. Additionally, overhead can be significantly reduced wrt. LECIM FSK PHY fragmentation, which is required for very low bit-rates to fulfill the FCC requirements. Joerg Robert, FAU Erlangen-Nuernberg

CSD 1.3 Comment: Quantify "high immunity to interference". Mar. 2018 CSD 1.3 Comment: Quantify "high immunity to interference". Text in PAR/CSD: Remarks / Answers to the Comments: TODO: Mentioned efficient transmission in densely used license-exempt frequency bands. Joerg Robert, FAU Erlangen-Nuernberg

Mar. 2018 CSD 1.2.5 Comment: None of the reasons given address why this specific, new addition will be similar in cost to existing 802.15.4 devices (which vary widely in cost, depending on which version of 802.15.4 you implement). Are there LECIM devices fielded? Text in PAR/CSD: Remarks / Answers to the Comments: TODO: Joerg Robert, FAU Erlangen-Nuernberg

Mar. 2018 CSD 1.2.5 cont’d Comment: The answer for c) does not address item c), which has to do with installation costs, no manufacturing methods. Text in PAR/CSD: Remarks / Answers to the Comments: TODO: Similar comment as previous slide Joerg Robert, FAU Erlangen-Nuernberg

In response to the comments from IEEE 802.3 Mar. 2018 In response to the comments from IEEE 802.3 Joerg Robert, FAU Erlangen-Nuernberg

PAR 5.3 Comment: Question is not answered, please do so. Mar. 2018 PAR 5.3 Comment: Question is not answered, please do so. Text in PAR/CSD: Is the completion of this standard dependent upon the completion of another standard: No Remarks / Answers to the Comments: Accept: Answer to question is added. Joerg Robert, FAU Erlangen-Nuernberg

Mar. 2018 PAR 6.1b Comment: Not sure who recommended review but if so, the RAC Chair is unaware of a recommendation from the RAC or from editorial staff (typically occurring because of content found in MEC review). RAC review can also be requested by the WG/TG later without a PAR modification if "not anticipated" registry related content appears in the draft. Please refer to the PAR form instructions (copied at end of slide deck) for when a Yes answer is appropriate and consider if the answer should be changed to No. (The RAC has reviewed IEEE Std 802.15.4.) Text in PAR/CSD: 6.1.b. Is the Sponsor aware of possible registration activity related to this project?: YesNo If yes please explain: There should be none but a RAC review is recommended Remarks / Answers to the Comments: Accept: Registration activity is not required. Answer is changed to “no”. Joerg Robert, FAU Erlangen-Nuernberg

Mar. 2018 CSD 1.2.5c Comment: The answer about manufacturing costs is non-responsive to the question about installation costs. Please provide a responsive answer. Text in PAR/CSD: Implementation of this amendment requires no change to current manufacturing methods or installations. Therefore, no significant additional costs are expected. Remarks / Answers to the Comments: Accept: Text to clarify installation costs is added to CSD document. Joerg Robert, FAU Erlangen-Nuernberg

Mar. 2018 CSD 1.2.5d Comment: Change IEEE Std. 802.15.4 to IEEE Std 802.15.4 (remove the dot after Std). Text in PAR/CSD: There are already devices using IEEE Std. 802.15.4 in volume shipment operating in the same frequency bands and PHY modes. Remarks / Answers to the Comments: Accept: Dot is removed in the revised CSD document. Joerg Robert, FAU Erlangen-Nuernberg

In response to the comments from IEEE 802.11 Mar. 2018 In response to the comments from IEEE 802.11 Joerg Robert, FAU Erlangen-Nuernberg

PAR 2.1 Comment: Use of “Low Power” should include a range or limit. Mar. 2018 PAR 2.1 Comment: Use of “Low Power” should include a range or limit. Text in PAR/CSD: Amendment for a Low Power Wide Area Network (LPWAN) extension to the LECIM (low-energy, critical infrastructure monitoring) Physical layer (PHY) with typical transmit powers of 14 dBm. Remarks / Answers to the Comments: Accept: Definition of low power added to the PAR. Joerg Robert, FAU Erlangen-Nuernberg

PAR 2.1 cont’d Comment: expand “LEICM” Text in PAR/CSD: Mar. 2018 PAR 2.1 cont’d Comment: expand “LEICM” Text in PAR/CSD: Amendment for a Low Power Wide Area Network (LPWAN) extension to the LECIM (low-energy, critical infrastructure monitoring) Physical layer (PHY) with typical transmit powers of 14 dBm. Remarks / Answers to the Comments: Accept: LECIM is expanded. Joerg Robert, FAU Erlangen-Nuernberg

PAR 5.2b Comment: editorial remove extra period “Std.” should be “Std” Mar. 2018 PAR 5.2b Comment: editorial remove extra period “Std.” should be “Std” Text in PAR/CSD: This amendment defines a Low Power Wide Area Network (LPWAN) extension to the IEEE Std. 802.15.4 LECIM PHY layer. Remarks / Answers to the Comments: Accept: Text is modified as suggested. Joerg Robert, FAU Erlangen-Nuernberg

PAR 5.2b cont’d Comment: correct “<30kBit/s” should “ Mar. 2018 PAR 5.2b cont’d Comment: correct “<30kBit/s” should “ Text in PAR/CSD: It uses the LECIM PHY FSK (Frequency Shift Keying) PHY modulation schemes with extensions to lower bit-rates (e.g. payload bit-rate typically < 30 kbBit/s). Remarks / Answers to the Comments: Accept: “<30kBit/s” is changed to “< 30 kb/s” Joerg Robert, FAU Erlangen-Nuernberg

PAR 5.2b cont’d Comment: expand “FSK” Text in PAR/CSD: Mar. 2018 PAR 5.2b cont’d Comment: expand “FSK” Text in PAR/CSD: It uses the LECIM PHY FSK (Frequency Shift Keying) PHY modulation schemes with extensions to lower bit-rates (e.g. payload bit-rate typically < 30 kbBit/s). Remarks / Answers to the Comments: Accept: The term FSK is expanded in the PAR document. The order of FSK and PHY is changed. Joerg Robert, FAU Erlangen-Nuernberg

Mar. 2018 PAR 5.2b cont’d Comment: delete “Furthermore, it defines lower code rates of the FEC in addition to the K=7 R=1/2 convolutional code. Modifications to the Medium Access Control (MAC) layer, needed to support this PHY extension, are defined as needed.” or at least reword to be definitive and define “lower code rates” and the reword to make meaning of “K=7 R=1/2 convolutional code” clear. Text in PAR/CSD: Remarks / Answers to the Comments: TODO: Remove part completely? Joerg Robert, FAU Erlangen-Nuernberg

Mar. 2018 PAR 5.2b Comment: define the expected range of “Wide Area Network”. i.e. what are you expecting to reach. Text in PAR/CSD: This amendment defines a Low Power Wide Area Network (LPWAN) extension to the IEEE Std. 802.15.4 LECIM PHY layer to cover network cell radii of typically 10 - 15 km in rural areas and deep in-building penetration in urban areas. Remarks / Answers to the Comments: Accept: Added text to anticipate the range of typical LPWAN networks. (Identical to comment on Slide 4) Joerg Robert, FAU Erlangen-Nuernberg

Mar. 2018 PAR 5.5 Comment: What is “very high link margin” vs “high link margin”? rewording is expected. Text in PAR/CSD: A main functional requirement for LPWANs is achieving a very high link margin of typically 155 dB - 160 dB to deal with interferers and achieve distance of typically 10 km - 15 km in rural areas using transmit powers of 14 dBm, while maintaining low energy consumption. Remarks / Answers to the Comments: Accept: The word “very” is added at the first location to make the “very high link margin” consistent. Additionally, a commonly accepted link margin range figure (e.g. ETSI, 3GPP) of 155 dB – 160 dB is added. Joerg Robert, FAU Erlangen-Nuernberg

Mar. 2018 PAR 5.5 cont’d Comment: Please include definition of the expected range and power that is being included in the specification. Text in PAR/CSD: A main functional requirement for LPWANs is achieving a very high link margin of typically 155 dB - 160 dB to deal with interferers and achieve distance of typically 10 km - 15 km in rural areas using transmit powers of 14 dBm, while maintaining low energy consumption. Remarks / Answers to the Comments: Accept: The expected range and the power are added to the PAR document. Joerg Robert, FAU Erlangen-Nuernberg

Mar. 2018 PAR 5.5 cont’d Comment: “guarantee” reword this sentence as you will not be able to “guarantee” in general. Text in PAR/CSD: The end result is the inability to achieve guarantee the required transmission reliability in such scenarios. This amendment is needed to close this gap and to provide interference robust reliable transmission at receiver sensitivities of -140dBm while delivering multiyear battery life. Remarks / Answers to the Comments: Accept: The word “guarantee” is removed from the PAR. (Similar comment on slide 8) Joerg Robert, FAU Erlangen-Nuernberg

Mar. 2018 PAR 5.6 Comment: delete “and similar organtizations” – not necessary (and misspelled). Text in PAR/CSD: Chip Vendors, Product Manufacturers, Wireless Carriers, Utilities, Cities, Agriculture, Infrastructure/Environmental Monitoring Organizations and similar organtizations. Remarks / Answers to the Comments: Accept: Text is deleted from the PAR document. Joerg Robert, FAU Erlangen-Nuernberg

PAR 8.1 Comment: Add full name of the cited “IEEE Std 802.11h. Mar. 2018 PAR 8.1 Comment: Add full name of the cited “IEEE Std 802.11h. Text in PAR/CSD: IEEE Std 802.11ah, Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications, Amendment 2: Sub 1 GHz License Exempt Operation Remarks / Answers to the Comments: Accept: Added full name as requested to the PAR document. Joerg Robert, FAU Erlangen-Nuernberg