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Báo cáo hóa học: " Research Article Power-Efficient Communication Protocol for Integrated WWAN and WLAN"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Power-Efficient Communication Protocol for Integrated WWAN and WLAN | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 342141 13 pages doi 10.1155 2008 342141 Research Article Power-Efficient Communication Protocol for Integrated WWAN and WLAN SuKyoung Lee 1 WonSik Chung 1 KunHo Hong 1 and Nada Golmie2 1 Department of Computer Science Engineering College Yonsei University Seoul 120-749 South Korea 2 National Institute of Standards and Technology Gaithersburg MD 20899 USA Correspondence should be addressed to SuKyoung Lee sklee@cs.yonsei.ac.kr Received 27 February 2007 Revised 27 August 2007 Accepted 31 October 2007 Recommended by Kameswara Rao Namuduri One of the most impending requirements to support a seamless communication environment in heterogeneous wireless networks comes from the limited power supply of small-size and low-cost mobile terminals as in stand-alone WLANs or cellular networks. Thus it is a challenge to design new techniques so that mobile terminals are able to not only maintain their active connection as they move across different types of wireless networks but also minimize their power consumption. There have been several efforts aimed at having mobile devices equipped with multiple interfaces connect optimally to the access network that minimizes their power consumption. However a study of existing schemes for WLAN notes that in the idle state a device with both a WLAN and a WWAN interface needs to keep both interfaces on in order to receive periodic beacon messages from the access point AP WLAN and downlink control information from the base station WWAN resulting in significant power consumption. Therefore in this paper we propose a power-efficient communication protocol PCP that includes turning off the WLAN interface after it enters the idle state and using the paging channel of WWAN in order to wake up the WLAN interface when there is incoming long-lived multimedia data. This scheme is known to limit the power consumption while at the same time it