mobility-awareness which is a kind of context-awareness. Moreover, there are three variations of the proposed protocol in terms of how to choose the optimal state: SLUP/BS, SLUP/UITR, and SLUP/IUT<Tiut>. Experimental results show that the proposed protocol outperforms the well-known existing protocols such as dead-reckoning and distance-based protocol, and that the SLUP/IUT<Tiut> approach can achieve different performance tradeoffs between energy efficiency and location accuracy by fine-tuning its algorithmic parameter Tiut." />


Mobility-Awareness: An Efficient Approach to Improve Energy Efficiency in Location-Aware Computing

MoonBae SONG  KwangJin PARK  Ki-Sik KONG  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E89-D   No.5   pp.1662-1671
Publication Date: 2006/05/01
Online ISSN: 1745-1361
DOI: 10.1093/ietisy/e89-d.5.1662
Print ISSN: 0916-8532
Type of Manuscript: Special Section PAPER (Special Section on Challenges in Ad-hoc and Multi-hop Wireless Communications)
Category: 
Keyword: 
mobility-awareness,  context-awareness,  location update protocol,  energy efficiency,  SLUP,  location-aware computing,  

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Summary: 
There are two principal aspects of "mobility" in location-aware computing: (1) how to support mobility and (2) how to exploit it. This paper considers the latter, while many existing works only concentrate on the former. This work is trying to prove that the performance of location-aware systems will be greatly improved by understanding the user's movement. In this paper, we propose a novel location update protocol called state-based location update protocol (SLUP), which significantly minimizes the energy consumption of mobile client by exploiting a syntactic information of a user's movement. This concept is called mobility-awareness which is a kind of context-awareness. Moreover, there are three variations of the proposed protocol in terms of how to choose the optimal state: SLUP/BS, SLUP/UITR, and SLUP/IUT<Tiut>. Experimental results show that the proposed protocol outperforms the well-known existing protocols such as dead-reckoning and distance-based protocol, and that the SLUP/IUT<Tiut> approach can achieve different performance tradeoffs between energy efficiency and location accuracy by fine-tuning its algorithmic parameter Tiut.