{"id":3193,"date":"2019-02-20T08:52:05","date_gmt":"2019-02-20T08:52:05","guid":{"rendered":"https:\/\/www.beaconzone.co.uk\/blog\/?p=3193"},"modified":"2023-05-02T11:33:52","modified_gmt":"2023-05-02T11:33:52","slug":"bluetooth-mesh-standard-evaluation","status":"publish","type":"post","link":"https:\/\/www.beaconzone.co.uk\/blog\/bluetooth-mesh-standard-evaluation\/","title":{"rendered":"Bluetooth Mesh Standard Evaluation"},"content":{"rendered":"\n<p>There&#8217;s recent new research on <a rel=\"noreferrer noopener\" aria-label=\"The Bluetooth Mesh Standard: An Overview and Experimental Evaluation (opens in a new tab)\" href=\"https:\/\/biblio.ugent.be\/publication\/8577604\/file\/8577606.pdf\" target=\"_blank\">The Bluetooth Mesh Standard: An Overview and Experimental Evaluation<\/a> (pdf) by Mathias Baert, Jen Rossey, Adnan Shahid ID and Jeroen Hoebeke of Ghent University.<a href=\"\"><\/a><\/p>\n\n\n\n<p>The paper explains how the Bluetooth Mesh Standard came about to address the problem of the variety of BLE meshing solutions that were not interoperable. It includes a great introduction to Bluetooth LE and Mesh with some statistical and experimental insights into mesh performance.<\/p>\n\n\n\n<p>The authors explain how the choice of the use of advertising advertising at 100% duty cycle for lower end-to-end delay has degraded the low energy advantage of BLE advertising thus limiting the usefulness in power (battery) sensitive applications.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"516\" height=\"453\" src=\"https:\/\/www.beaconzone.co.uk\/blog\/wp-content\/uploads\/2019\/02\/meshhops.png\" alt=\"\" class=\"wp-image-3195\" srcset=\"https:\/\/www.beaconzone.co.uk\/blog\/wp-content\/uploads\/2019\/02\/meshhops.png 516w, https:\/\/www.beaconzone.co.uk\/blog\/wp-content\/uploads\/2019\/02\/meshhops-300x263.png 300w\" sizes=\"(max-width: 516px) 85vw, 516px\" \/><\/figure>\n\n\n\n<p>The paper contains some useful insights:<\/p>\n\n\n\n<ul>\n<li>The back off mechanism, used to decrease the chance of mesh network collisions, contributes most to the communication delay. However, as they identify, it&#8217;s this mechanism that provides reliability and scalability in larger networks. Disabling the backoff mechanism decreases the delay but makes the network less scaleable and robust.<\/li>\n\n\n\n<li>Making the network more dense, has a positive effect on the round trip time (RTT). However too a dense network leads to more collisions.<\/li>\n\n\n\n<li>Increasing the number of hops needed, making the network more sparse, has a negative effect on the RTT.<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><em>&#8220;It is clear that there are a lot of factors in\ufb02uencing the communication \ufb02ows within a Bluetooth Mesh network, requiring more advanced management mechanism for optimizing the performance of the mesh network.&#8221;<\/em><\/p>\n<\/blockquote>\n\n\n\n<p>However, the research had some limitations. Noise was simulated by introducing non-mesh beacons advertising every 20ms. This wasn&#8217;t very realistic given that most beacons advertise in the range 100ms to 1000ms. Re-transmit time was considered that complicated calculations &#8211; especially as re-transmit is application specific. It wasn&#8217;t mentioned that in many mesh sensing applications, unacknowledged messages are acceptable such that there&#8217;s no re-transmit. Also, the affect of other mesh network traffic, on the round trip time, wasn&#8217;t considered &#8211; only one mesh transmission at a time was considered.<\/p>\n\n\n\n<p>Read about <a rel=\"noreferrer noopener\" aria-label=\"Beacons and the Bluetooth Mesh (opens in a new tab)\" href=\"https:\/\/www.beaconzone.co.uk\/BluetoothMeshBeacons\" target=\"_blank\">Beacons and the Bluetooth Mesh<\/a> <\/p>\n","protected":false},"excerpt":{"rendered":"<p>There&#8217;s recent new research on The Bluetooth Mesh Standard: An Overview and Experimental Evaluation (pdf) by Mathias Baert, Jen Rossey, Adnan Shahid ID and Jeroen Hoebeke of Ghent University. The paper explains how the Bluetooth Mesh Standard came about to address the problem of the variety of BLE meshing solutions that were not interoperable. It &hellip; <a href=\"https:\/\/www.beaconzone.co.uk\/blog\/bluetooth-mesh-standard-evaluation\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Bluetooth Mesh Standard Evaluation&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,4,183,157],"tags":[],"_links":{"self":[{"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/posts\/3193"}],"collection":[{"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=3193"}],"version-history":[{"count":12,"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/posts\/3193\/revisions"}],"predecessor-version":[{"id":8454,"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/posts\/3193\/revisions\/8454"}],"wp:attachment":[{"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=3193"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=3193"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.beaconzone.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=3193"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}