January 2019 doc.: < 15-19-0039-00-004z > Project: IEEE
January 2019 doc.: < 15-19-0039-00-004z > Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [MAC for Secure Ranging] Date Submitted: [15 January 2019] Source: [Ayman Naguib (Apple) , Robert Golshan (Apple), Alexandar Krebs (BMW), Thomas Reisinger (Continental) ] Re: [Input to the Task Group] Abstract: [Presentation, enhancements to 802.15.4 for secure ranging, ranging integrity] Purpose:  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 Ayman Naguib (Apple), et al. January 2019
doc.: < 15-19-0039-00-004z > Hopping in Block-Based Ranging: Justification and Reasoning Submissio n Slide 2 Ayman Naguib (Apple), et al. January 2019 doc.: < 15-19-0039-00-004z > Block Structure Submissio n Slide 3 Ayman Naguib (Apple), et al. January 2019 doc.: < 15-19-0039-00-004z >
Hopping Modes -1 Submissio n Slide 4 Ayman Naguib (Apple), et al. January 2019 doc.: < 15-19-0039-00-004z > Hopping Modes - 2 Different hopping mechanisms to manage/align interference: 1. Round hopping within a block No Hopping Uniform random hopping Random Walk hopping 2. UWB packet hopping within a slot No Hopping Uniform random hopping Proposed text provides the hooks necessary to support hopping. However, it does not:
Define hopping patterns to be used and how these pattern are shared among RDEVs Criteria for triggering hopping Criteria for selecting which hopping mode to use (URH vs RWH) Submissio n Slide 5 Ayman Naguib (Apple), et al. January 2019 doc.: < 15-19-0039-00-004z > Hopping Modes - 3 Why random walk hopping? Shouldnt we just use uniform random hopping? With the current block structure and hopping definitions in the proposed text, what happens if a ranging exchange is lost due to interference and/or collision? Do the ranging devices become out of synch and have to start all over ? Submissio n
Slide 6 Ayman Naguib (Apple), et al. January 2019 doc.: < 15-19-0039-00-004z > Ranging Failure and Hopping Example 1 No loss in sync between RDEVs Submissio n Slide 7 Ayman Naguib (Apple), et al. January 2019 doc.: < 15-19-0039-00-004z > Ranging Failure and Hopping Example 2 Sync between RDEVs is lost for 1 ranging round only
Submissio n Slide 8 Ayman Naguib (Apple), et al. January 2019 doc.: < 15-19-0039-00-004z > Why Different Hopping Modes? - 1 Uniform random hopping will work fine for some of the cases Uniform random hopping, however, will result in a MAC sampling noise in use cases where RDEVs are expected to move at a varying speed: Uniform random hopping can results in non-uniform sampling in both location and velocity which may degrade the localization algorithm. Proposed MAC design addresses this by adding random walk hopping option. Submissio n Slide 9
Ayman Naguib (Apple), et al. January 2019 doc.: < 15-19-0039-00-004z > Why Different Hopping Modes? - 2 Ranging Frequency (Hz) e Trilateration 1st Order Prediction Uniform error distribution Triangular error distribution [emin,emax] e e
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