Load Shedding In Mobile Systems With Mobiqual


In location-based, mobile continual query (CQ) systems, two key measures of quality-of-service (QoS) are: freshness and accuracy. To achieve freshness, the CQ server must perform frequent query reevaluations. To attain accuracy, the CQ server must receive and process frequent position updates from the mobile nodes.

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. Hence, a key challenge for a mobile CQ system is: How do we achieve the highest possible quality of the CQ results, in both freshness and accuracy, with currently available resources?

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.

The design of MobiQual highlights three important features. 1) Differentiated load shedding: We apply different amounts of query load shedding and update load shedding to different groups of queries and mobile nodes, respectively. 2) Per-query QoS specification: Individualized QoS specifications are used to maximize the overall freshness and accuracy of the query results. 3) Low-cost adaptation: MobiQual dynamically adapts, with a minimal overhead, to changing load conditions and available resources.


We conduct a set of comprehensive experiments to evaluate the effectiveness of MobiQual. The results show that, through a careful combination of update and query load shedding, the MobiQual approach leads to much higher freshness and accuracy in the query results in all cases, compared to existing approaches that lack the QoS-awareness properties of MobiQual, as well as the solutions that perform query-only or update-only load shedding.


<< back

Related Projects : SMS Based Mobile Banking with Security ,SMS Based Student Intimation ,Social Networking With Advertisement ,Software Project Management ,SPAF: Stateless FSA-based Packet Filters ,Staying Connected in a Mobile Healthcare System ,Stealthy Attacks In Wireless Ad Hoc Networks ,Steganography In Audio Files ,Tanrox Work Force ,Text Encryption And Decryption ,Twitter Client For Android Based Smart Phone ,VAS for Hand Held Device ,Virtual Office Management ,Virtual Router Using Destination-Sequenced Distance Vector ,Voyage Management ,Web Enabled Automated Manufacturing System ,Web Alerts ,Web Blossom Bazzar ,Wireless Health Care System ,World Recipe ,Zeppelin Reservation



Copyright © V2computers 2006 through 2017