Cell keeps updating on nrf9160https://devzone.nordicsemi.com/f/nordic-q-a/85255/cell-keeps-updating-on-nrf9160Hello, We are doing some network quality tests on LTE-M with PSM off and notice loss on UDP between 0% to sometimes 15% on simple udp messages sent every 10 seconds from the server to a client running on thingy91. We noticed that when higher lossen-USTelligent Community 13Tue, 01 Mar 2022 15:35:31 GMTRE: Cell keeps updating on nrf9160https://devzone.nordicsemi.com/thread/355626?ContentTypeID=1Tue, 01 Mar 2022 15:35:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:986635b7-ce05-4c89-96c3-ebf433c9f563Einarh<p>I know the&nbsp;<a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/applications/asset_tracker_v2/doc/asset_tracker_v2_description.html">Asset tracker application</a>&nbsp;uses the&nbsp;<a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/libraries/modem/modem_info.html#modem-info-readme">Modem information library</a>&nbsp;to access the RSRP value as an indicator of signal strength, among other information from the modem.</p> <p>Hopefully you&#39;ll find that useful.</p> <p>-Einar</p><div style="clear:both;"></div>RE: Cell keeps updating on nrf9160https://devzone.nordicsemi.com/thread/355619?ContentTypeID=1Tue, 01 Mar 2022 15:13:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d39ed86e-e9ef-425c-8d64-1ee735aa2f5dnicolae.georgescu<p>Hello Einar,</p> <p></p> <p>Thanks for checking this!<br /><br />Ok understood, makes sense! <br /><br />Is there any way to read the current signal strength the modem gets? This would both confirm the problem and also help us choose an antenna in the future.<br /><br /><br />About UDP vs TCP, indeed, thanks for the suggestion! At this stage we want to know what the raw network quality is (both loss and delay), and TCP would basically hide the loss into delay or other issues as seen from the app level.<br /><br /><br />Thanks,<br />Nicolae</p><div style="clear:both;"></div>RE: Cell keeps updating on nrf9160https://devzone.nordicsemi.com/thread/355615?ContentTypeID=1Tue, 01 Mar 2022 15:05:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8896c051-97b4-4e3d-805e-6cf6dc03152cEinarh<p>Hello!</p> <p>From my understanding, the nRF9160 will only actively search for cells if the current cell signal is weak:</p> <p><a href="https://infocenter.nordicsemi.com/index.jsp?topic=%2Fref_at_commands%2FREF%2Fat_commands%2Fmob_termination_ctrl_status%2Fnbrgrsrp.html">To save energy, nRF9160 does not search and measure neighboring cells for mobility purposes if the level and quality of the serving cell signal are above the thresholds defined by the network.</a></p> <p>So I believe the reason your device keeps switching cells is because it is unable to find a signal it is satisfied with, and this threshold seems to be set by the network, not the device.</p> <p>Also, yes I do believe it is likely that packet loss can happen on a cell change.</p> <p>If it is very important for your application that every packet reaches the device, have you considered using TCP rather than UDP?</p> <p>Best regards,</p> <p>Einar</p><div style="clear:both;"></div>RE: Cell keeps updating on nrf9160https://devzone.nordicsemi.com/thread/355376?ContentTypeID=1Mon, 28 Feb 2022 19:19:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a51c476d-de3d-4098-b40c-29e62d09be14Sinan OZEKEN<div class="LTRStyle" style="direction:ltr;display:none;text-align:left;" id="WidgetFloaterPanels"> <div style="display:none;" id="WidgetFloater"> <div id="WidgetLogoPanel"><span id="WidgetTranslateWithSpan"><span>TRANSLATE with </span></span> <span id="WidgetCloseButton" title="Exit Translation">x</span></div> <div id="LanguageMenuPanel"> <div class="DDStyle_outer"><span class="DDStyle" id="__LanguageMenu_header">English</span> <div style="left:0;position:relative;text-align:left;"> <div style="position:absolute;"> <div class="DDStyle" style="display:none;" id="__LanguageMenu_popup"> <table id="LanguageMenu" border="0"> <tbody> <tr> <td><a href="#ar">Arabic</a></td> <td><a href="#he">Hebrew</a></td> <td><a href="#pl">Polish</a></td> </tr> <tr> <td><a href="#bg">Bulgarian</a></td> <td><a href="#hi">Hindi</a></td> <td><a href="#pt">Portuguese</a></td> </tr> <tr> <td><a href="#ca">Catalan</a></td> <td><a href="#mww">Hmong Daw</a></td> <td><a href="#ro">Romanian</a></td> </tr> <tr> <td><a href="#zh-CHS">Chinese Simplified</a></td> <td><a href="#hu">Hungarian</a></td> <td><a href="#ru">Russian</a></td> </tr> <tr> <td><a href="#zh-CHT">Chinese Traditional</a></td> <td><a href="#id">Indonesian</a></td> <td><a href="#sk">Slovak</a></td> </tr> <tr> <td><a href="#cs">Czech</a></td> <td><a href="#it">Italian</a></td> <td><a href="#sl">Slovenian</a></td> </tr> <tr> <td><a href="#da">Danish</a></td> <td><a href="#ja">Japanese</a></td> <td><a href="#es">Spanish</a></td> </tr> <tr> <td><a href="#nl">Dutch</a></td> <td><a href="#tlh">Klingon</a></td> <td><a href="#sv">Swedish</a></td> </tr> <tr> <td><a href="#en">English</a></td> <td><a href="#ko">Korean</a></td> <td><a href="#th">Thai</a></td> </tr> <tr> <td><a href="#et">Estonian</a></td> <td><a href="#lv">Latvian</a></td> <td><a href="#tr">Turkish</a></td> </tr> <tr> <td><a href="#fi">Finnish</a></td> <td><a href="#lt">Lithuanian</a></td> <td><a href="#uk">Ukrainian</a></td> </tr> <tr> <td><a href="#fr">French</a></td> <td><a href="#ms">Malay</a></td> <td><a href="#ur">Urdu</a></td> </tr> <tr> <td><a href="#de">German</a></td> <td><a href="#mt">Maltese</a></td> <td><a href="#vi">Vietnamese</a></td> </tr> <tr> <td><a href="#el">Greek</a></td> <td><a href="#no">Norwegian</a></td> <td><a href="#cy">Welsh</a></td> </tr> <tr> <td><a href="#ht">Haitian Creole</a></td> <td><a href="#fa">Persian</a></td> <td></td> </tr> </tbody> </table> </div> </div> </div> </div> </div> <div id="CTFLinksPanel"><span id="ExternalLinksPanel"><a id="HelpLink" title="Help" href="https://go.microsoft.com/?linkid=9722454" rel="noopener noreferrer" target="_blank"> </a> <a id="EmbedLink" title="Get this widget for your own site"></a> <a id="ShareLink" title="Share translated page with friends"></a> </span></div> <div id="FloaterProgressBar"><span id="ProgressFill"></span></div> </div> <div style="display:none;" id="WidgetFloaterCollapsed"><span>TRANSLATE with </span></div> <div style="display:none;" id="FloaterSharePanel"> <div id="ShareTextDiv"><span id="ShareTextSpan"> COPY THE URL BELOW </span></div> <div id="ShareTextboxDiv"><!--a id="TwitterLink" title="Share on Twitter"> <img id="TwitterImg" /></a> <a--> <a id="EmailLink" title="Email this translation"></a> </div> <div id="ShareFooter"><span id="ShareHelpSpan"><a id="ShareHelpLink"></a> </span> <span id="ShareBackSpan"><a id="ShareBack" title="Back To Translation"></a> Back</span></div> </div> <div style="display:none;" id="FloaterEmbed"> <div id="EmbedTextDiv"><span id="EmbedTextSpan">EMBED THE SNIPPET BELOW IN YOUR SITE</span> <a id="EmbedHelpLink" title="Copy this code and place it into your HTML."></a> </div> <div id="EmbedTextboxDiv"></div> <div id="EmbedNoticeDiv"><span id="EmbedNoticeSpan">Enable collaborative features and customize widget: <a href="http://www.bing.com/widget/translator" rel="noopener noreferrer" target="_blank">Bing Webmaster Portal</a></span></div> <div id="EmbedFooterDiv"><span id="EmbedBackSpan">Back</span></div> </div> </div><div style="clear:both;"></div>