Radio Resource Control

<h2 id="rrc-inactivity-timers">RRC inactivity timers</h2>
The configuration of RRC inactivity timers in a W-CDMA network has considerable impact on the battery life of a phone when a packet data connection is open.<a class="footnote-ref" id="fnref:9" href="#fn:9">9</a>
The RRC idle mode (no connection) has the lowest energy consumption. The states in the RRC connected mode, in order of decreasing power consumption, are CELL_DCH (Dedicated Channel), CELL_FACH (Forward Access Channel), CELL_PCH (Cell Paging Channel) and URA_PCH (URA Paging Channel). The power consumption in the CELL_FACH is roughly 50 percent of that in CELL_DCH, and the PCH states use about 1-2 percent of the power consumption of the CELL_DCH state.<a class="footnote-ref" id="fnref:10" href="#fn:10">10</a>
The transitions to lower energy consuming states occur when inactivity timers trigger. The T1 timer controls transition from DCH to FACH, the T2 timer controls transition from FACH to PCH, and the T3 timer controls transition from PCH to idle.<a class="footnote-ref" id="fnref:11" href="#fn:11">11</a>
Different operators have different configurations for the inactivity timers, which leads to differences in energy consumption.<a class="footnote-ref" id="fnref:12" href="#fn:12">12</a> Another factor is that not all operators use the PCH states.<a class="footnote-ref" id="fnref:13" href="#fn:13">13</a>

<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Radio_Resource_Management/AC4jhxu9">Radio Resource Management</a></li>
<li><a href="/facts/Mobility_management/YDFn4RQL">Mobility management</a></li>
<li><a href="/facts/Radio_Network_Controller/kHofdQGC">Radio Network Controller</a></li>
<li><a href="/facts/UMTS/lhy2RrMw">UMTS</a></li>
<li><a href="/facts/WCDMA/lhy2RrMw">WCDMA</a></li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1">3GPP TS 25.331 Radio Resource Control (RRC); Protocol specification <a href="http://www.3gpp.org/ftp/Specs/html-info/25331.htm" target="_blank">http://www.3gpp.org/ftp/Specs/html-info/25331.htm</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></li>
<li id="fn:2">3GPP TS 36.331 Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification <a href="http://www.3gpp.org/ftp/Specs/html-info/36331.htm" target="_blank">http://www.3gpp.org/ftp/Specs/html-info/36331.htm</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></li>
<li id="fn:3">3GPP TS 38.331 NR; Radio Resource Control (RRC); Protocol specification <a href="https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3197" target="_blank">https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3197</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></li>
<li id="fn:4">UMTS RRC Protocol specification (version 12.4.0 Release 12) (PDF), European Telecommunications Standards Institute, February 2015 <a href="http://www.etsi.org/deliver/etsi_ts/125300_125399/125331/12.04.00_60/ts_125331v120400p.pdf" target="_blank">http://www.etsi.org/deliver/etsi_ts/125300_125399/125331/12.04.00_60/ts_125331v120400p.pdf</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></li>
<li id="fn:5">Pe´rez-Romero, Jordi (2005). Radio Resource Management Strategies in UMTS. John Wiley & Sons Ltd. p. 103. ISBN 0470022779. Retrieved 10 April 2015. <a href="0470022779" target="_blank">0470022779</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></li>
<li id="fn:6">Pe´rez-Romero, Jordi (2005). Radio Resource Management Strategies in UMTS. John Wiley & Sons Ltd. p. 103. ISBN 0470022779. Retrieved 10 April 2015. <a href="0470022779" target="_blank">0470022779</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></li>
<li id="fn:7">Qian, Feng (November 2010). "Characterizing Radio Resource Allocation for 3G Networks" (PDF). Proceedings of the 10th ACM SIGCOMM conference on Internet measurement. Melbourne, Australia: ACM. pp. 137–150. <a href="https://www.cs.columbia.edu/~lierranli/coms6998-7Spring2014/papers/RRC3G_imc2010.pdf" target="_blank">https://www.cs.columbia.edu/~lierranli/coms6998-7Spring2014/papers/RRC3G_imc2010.pdf</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></li>
<li id="fn:8">Qian, Feng (November 2010). "Characterizing Radio Resource Allocation for 3G Networks" (PDF). Proceedings of the 10th ACM SIGCOMM conference on Internet measurement. Melbourne, Australia: ACM. pp. 137–150. <a href="https://www.cs.columbia.edu/~lierranli/coms6998-7Spring2014/papers/RRC3G_imc2010.pdf" target="_blank">https://www.cs.columbia.edu/~lierranli/coms6998-7Spring2014/papers/RRC3G_imc2010.pdf</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></li>
<li id="fn:9">Henry Haverinen, Jonne Siren and Pasi Eronen (April 2007). "Energy Consumption of Always-On Applications in WCDMA Networks" (PDF). In Proceedings of the 65th Semi-Annual IEEE Vehicular Technology Conference. Dublin, Ireland. <a href="http://ms11.voip.edu.tw/~linear/haverinen_siren_eronen_vtc2007.pdf" target="_blank">http://ms11.voip.edu.tw/~linear/haverinen_siren_eronen_vtc2007.pdf</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></li>
<li id="fn:10">Henry Haverinen, Jonne Siren and Pasi Eronen (April 2007). "Energy Consumption of Always-On Applications in WCDMA Networks" (PDF). In Proceedings of the 65th Semi-Annual IEEE Vehicular Technology Conference. Dublin, Ireland. <a href="http://ms11.voip.edu.tw/~linear/haverinen_siren_eronen_vtc2007.pdf" target="_blank">http://ms11.voip.edu.tw/~linear/haverinen_siren_eronen_vtc2007.pdf</a> <a href="#fnref:10" class="footnote-back-ref">↩</a></li>
<li id="fn:11">Henry Haverinen, Jonne Siren and Pasi Eronen (April 2007). "Energy Consumption of Always-On Applications in WCDMA Networks" (PDF). In Proceedings of the 65th Semi-Annual IEEE Vehicular Technology Conference. Dublin, Ireland. <a href="http://ms11.voip.edu.tw/~linear/haverinen_siren_eronen_vtc2007.pdf" target="_blank">http://ms11.voip.edu.tw/~linear/haverinen_siren_eronen_vtc2007.pdf</a> <a href="#fnref:11" class="footnote-back-ref">↩</a></li>
<li id="fn:12">L. de Bruynseels, “Tuning Inactivity Timer Settings in UMTS”, white 
paper, Commsquare Ltd., 2005 <a href="#fnref:12" class="footnote-back-ref">↩</a></li>
<li id="fn:13">Henry Haverinen, Jonne Siren and Pasi Eronen (April 2007). "Energy Consumption of Always-On Applications in WCDMA Networks" (PDF). In Proceedings of the 65th Semi-Annual IEEE Vehicular Technology Conference. Dublin, Ireland. <a href="http://ms11.voip.edu.tw/~linear/haverinen_siren_eronen_vtc2007.pdf" target="_blank">http://ms11.voip.edu.tw/~linear/haverinen_siren_eronen_vtc2007.pdf</a> <a href="#fnref:13" class="footnote-back-ref">↩</a></li>
</ol>

Radio Resource Control open-in-new

Radio Resource Control