1. doc.: IEEE 802.15-12-0504-00-004q Submission ETRI September 2012 Slide 1 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: Considerations on ULP Date Submitted: 17 September, 2012 Source: Tae-Joon Park, Wun-Cheol Jeong, Chang-Sub Shin, Hoyong Kang Company: ETRI Address: 161 Gajeong-dong, Yuseong-gu, Daejeon, KOREA Voice: +82-42-860-6902, FAX: +82-42-860-4197, E-Mail: tjpark@etri.re.kr Re: 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.

2. doc.: IEEE 802.15-12-0504-00-004q Submission ETRI September 2012 Slide 2 Considerations on ULP Tae-Joon Park, Wun-Cheol Jeong, Chang-Sub Shin, Hoyong Kang ETRI

3. doc.: IEEE 802.15-12-0504-00-004q Submission ETRI September 2012 Slide 3 The maximum allowable power(current) for sensor node(end device) is limited to coin cell batteries [1] −Max. current of coin cell battery : 5mA / 8mA / 10mA / 15mA … −Power consumption −Tx / Rx PHY : −CPU(MAC) : MSP430, Atmega128, PIC24F XLP −Sensor, … The battery life of several years when connected to coin cell batteries [4]  energy efficiency −MAC −Collisions, throughput, delay −Well known to everyone in 15.4 −PHY −Tx power / Rx sensitivity Power limit & Energy efficiency

4. doc.: IEEE 802.15-12-0504-00-004q Submission ETRI September 2012 Slide 4 “Shall not exceed 15mW at 0 dbm tx power” ??? −Implementation dependent −Power consumption estimation is not easy −an equation with more than one unknown Propose : one-hop star topology, mainly indoor(?) −Coin cell operated end node, mains powered coordinator −Power limit : asymmetric PHY −Low Tx power / Rx sensitivity : coin cell battery operated endpoint devices −High Tx power / Rx sensitivity : mains powered coordinator −Coding gain vs power consumption −Energy efficient MAC for end devices −Duty cycling / endpoint device initiated MAC −Simple MAC for end device −Minor revision of TG4k Results

5. doc.: IEEE 802.15-12-0504-00-004q Submission ETRI September 2012 Slide 5 References [1] 15-12-0383-00-004q-a-limitation-of-coin-cell-batteries.pptx [2] 15-12-0389-00-004q-design-considerations-and- applications-for-ulp.ppt [3] 15-12-0381-00-004q-technical-requirements-of-ulp-sensor- networks.pptx [4] 15-12-0386-02-004q-ulp-par.docx