Date Added: Feb 2012
Freshness and accuracy are two key measures of Quality of Service (QoS) in location-based, mobile Continual Queries (CQs). However, it is often difficult to provide both fresh and accurate CQ results due to limited resources in computing and communication and fast-changing load conditions caused by continuous mobile node movement. Thus a key challenge for a mobile CQ system is: how do the people achieve the highest possible quality of the query results, in both freshness and accuracy, with currently available resources under changing load conditions? In this paper, the authors formulate this problem as a load shedding one, and develop Mobi-Qual QoS-aware framework for performing both update load shedding and query load shedding.