COMPRESSION-INCORPORATED HIBERNATION FOR

LOW-POWER MOBILE EMBEDDED SYSTEM

Hyojun Kim: Samsung Electronics, 314, Maetan3-dong, Paltal-Ku, Suwon, Kyongi-do 442-743, Korea (TEL) +82-2-3416-0383 (FAX) +82-2-3416-0303 (E-Mail) zartoven@samsung.com (URL) http://www.sec.com

Youngsoo Han: Samsung Electronics, 314, Maetan3-dong, Paltal-Ku, Suwon, Kyongi-do 442-743, Korea (E-Mail) yshan@samsung.com

Eunjung Kang: Samsung Electronics, 314, Maetan3-dong, Paltal-Ku, Suwon, Kyongi-do 442-743, Korea (E-Mail) ej.kang@samsung.com

Youjup Won: Hanyang University 17 Haengdang-dong, Seongdong-gu, Seoul,133-791, Korea (E-Mail) yjwon@ece.hanyang.ac.kr

Jong-Il Park: Hanyang University 17 Haengdang-dong, Seongdong-gu, Seoul,133-791, Korea (E-Mail) jipark@hanyang.ac.kr

Abstract

Hibernation is a low-power technique which has been used on laptop computer to reduce self-refresh power of SDRAM during the suspend mode. By copying whole main memory into a hard disk, the system can be completely turned off and recovered whenever a user want to. For the mobile embedded systems, it is difficult to adopt the hibernation technique because the same amount of nonvolatile storage as main memory is necessary but prohibitively expensive. In this research, we proposed a new mobile hibernation method with NAND flash memory and compression techniques. We used compression technique to reduce required NAND flash capacity and to minimize sleeping time. We have explored several compression algorithms to find best algorithm by experiments and we proposed a RLE+LZW method as a proper compression algorithm. We implemented the hibernation on a PocketPC2002 PDA, and it presented about 15% energy saving effect with realistic power analysis. We show that mobile hibernation reduces suspending power and enables fast booting.

Short Biography

Hyojun Kim: Hyojun Kim is an engineer of Samsung electronics. He is currently developing NAND flash memory related software, such as flash translation layer and flash native file system.

He received a BS degree from the Department of Electronic Engineering, Sogang University, in 1999, and he is in master’s course at the department of ECE division of Hanyang University with company’s support.

Youngsoo Han: Youngsoo Han has worked for Digital Media Division of Samsung Electronics from 1996. He developed the firmware and device driver of laser printer. He is interested in compression algorithm.

He received a BS degree from the Department of Electronic Engineering, KyungPook National University in 1996, and he is in master’s course at the department of ECE division of Hanyang University with company’s support.

Eunjung Kang: Eunjung Kang is an engineer of R&D part of DVS division at Samsung Electronics and her research topic is networking technology.

She received a BS degree from the Department of Electronic Communication Engineering, Kwangwoon University in 1996, and she is in master’s course at the department of ECE division of Hanyang University with company’s support.

Youjup Won: He is currently assistant professor at Division of Electrical and Computer Engineering, Hanyang University, Seoul Korea. He is leading Distributed Multimedia Computing Lab. He did his BS and MS in Dept. of Computer Science, Seoul National University, Seoul, Korea in 1990 and 1992, respectively. He received his Ph. D in Computer Science from University of Minnesota in 1997. Before joining Hanyang University in 1999, he worked at Intel Corp. as Server Performance Analyst. His research interests include Internet Traffic Measurement, Modeling and Analysis, Mining for Actionable Knowledge, Multimedia system and networking, Performance modeling and analysis, Intelligent Storage subsystem, software support for low power system.

Jong-Il Park: He is currently assistant professor at Division of Electrical and Computer Engineering, Hanyang University, Seoul Korea. He is leading Mixed Reality Lab. He did his BS, MS and Ph. D in Dept. of Electronic Engineering, Seoul National University, Seoul, Korea in 1987, 1989, and 1995, respectively. Before joining Hanyang University 1999, he worked at NHK Science and Technical Research Laboratories as a visiting researcher.