19-02-2013, 10:52 AM
Load Shedding in Mobile Systems with MobiQual
[attachment=51289]
Definition
In location-based, mobile continual query (CQ) systems, two key measures of quality-of- service (QoS) are:
freshness and accuracy.
However, it is often difficult to obtain fresh and accurate CQ results simultaneously, due to
1) limited resources in computing and communication and
2) fast-changing load conditions caused by continuous mobile node movement.
In this paper, we formulate this problem as a load shedding one, and develop MobiQual—a QoS-aware approach to performing both update load shedding and query load shedding.
EXISTING SYSTEM:
To the best of our knowledge, none of the existing work has exploited the potential of performing load shedding to maximize the application-level freshness and accuracy of mobile queries.
In contrast to existing work on scalable query processing and indexing techniques, MobiQual provides a QoSaware framework for performing both update load shedding and query load shedding, in order to provide highly accurate and fresh query results, even under limited resources or overload conditions.
Moreover, as a complementary solution, MobiQual can easily take advantage of existing query processing and indexing techniques.
PROPOSED SYSTEM:
The salient feature of MobiQual design is its ability to perform dynamic update load shedding and query load shedding according to changing workload characteristics and resource constraints, and its ability to reduce or avoid severe performance degradation in query result quality under such conditions. Mobi- Qual employs query grouping and space partitioning techniques to reduce the adaptation time required for re-configuring the system in response to high system dynamics, such as the number of queries, the number of mobile nodes, and the evolving movement patterns.
Advantages
MobiQual is capable of providing high-quality query results by dynamically determining the appropriate amount of update load shedding and query load shedding to be performed according to the application-level QoS specifications of the queries.
a careful combination of location update load shedding and location query load shedding can significantly outperform the approaches that are based on query-only or update-only load shedding;
MobiQual provides higher quality guarantees compared to the approaches that lack the supports of QoS awareness and differentiated load shedding.
[attachment=51289]
Definition
In location-based, mobile continual query (CQ) systems, two key measures of quality-of- service (QoS) are:
freshness and accuracy.
However, it is often difficult to obtain fresh and accurate CQ results simultaneously, due to
1) limited resources in computing and communication and
2) fast-changing load conditions caused by continuous mobile node movement.
In this paper, we formulate this problem as a load shedding one, and develop MobiQual—a QoS-aware approach to performing both update load shedding and query load shedding.
EXISTING SYSTEM:
To the best of our knowledge, none of the existing work has exploited the potential of performing load shedding to maximize the application-level freshness and accuracy of mobile queries.
In contrast to existing work on scalable query processing and indexing techniques, MobiQual provides a QoSaware framework for performing both update load shedding and query load shedding, in order to provide highly accurate and fresh query results, even under limited resources or overload conditions.
Moreover, as a complementary solution, MobiQual can easily take advantage of existing query processing and indexing techniques.
PROPOSED SYSTEM:
The salient feature of MobiQual design is its ability to perform dynamic update load shedding and query load shedding according to changing workload characteristics and resource constraints, and its ability to reduce or avoid severe performance degradation in query result quality under such conditions. Mobi- Qual employs query grouping and space partitioning techniques to reduce the adaptation time required for re-configuring the system in response to high system dynamics, such as the number of queries, the number of mobile nodes, and the evolving movement patterns.
Advantages
MobiQual is capable of providing high-quality query results by dynamically determining the appropriate amount of update load shedding and query load shedding to be performed according to the application-level QoS specifications of the queries.
a careful combination of location update load shedding and location query load shedding can significantly outperform the approaches that are based on query-only or update-only load shedding;
MobiQual provides higher quality guarantees compared to the approaches that lack the supports of QoS awareness and differentiated load shedding.