MobiQual: QoS-aware Load Shedding in Mobile CQ Systems

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 (a) limited resources in computing and communication and (b) fast-changing load conditions caused by continuous mobile node movement. Thus a key challenge for a mobile CQ system is: How do we 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, we formulate this problem as a load shedding one, and develop MobiQual - a QoS-aware framework for performing both update load shedding and query load shedding. The design of MobiQual highlights three important features. (1) Differentiated load shedding: Different amounts of query and update load shedding are applied to different groups of queries and mobile nodes, respectively. (2) Per-query QoS specifications: The overall ...

• Type: Conference
• Year: 2008
• Where: ICDE
• Authors: Bugra Gedik, Kun-Lung Wu, Philip S. Yu, Ling Liu
• Keywords: Database, ICDE 2008, Load Conditions, Query Load, Update Load Shedding