QoS Based on Context-Aware Middleware in Wireless Sensor Network

QoS Based on Context-Aware Middleware in Wireless Sensor Network Yuan Wenjie Chen Chao Chen Mingsong

Outline • Basic Introduction • Analysis • Scenarios • Challenges • Related Works • A Prototype • Why • A Conceptual Middleware • Conclusion

Basic introduction • Context-aware system Family Room Den Media Center Extender (MCX) Media Center PC Media Center Extender Longhorn PC Xbox Kid’s Room Master Bedroom

Basic introduction • Context • computing context ----network connectivity, bandwidth, nearby resources… • user context ----user’s profile, location, behavior preference… • physical context ----lighting, noise, temperature... • temporal context ----time, delay, duration…

Basic introduction providing logic reasoning services to process context information Necessary parts Context Provider Context interpreter Context Database Abstracting useful contexts from heterogeneous sources, and convert them to certain representations. Storing current and past contexts for a particular subdomain. Each domain has one logic context database.

Basic introduction • QoS-Quality of Service • What is QoS? • Application perspective • Network perspective

Scenarios • Consider following cases for a smart space with various location sensors deployed: • Population bursts… System crashes due to overload? Or let’s make a little compromise? • Multiple services available, Ultrasonic, RFID, pressure sensor, webcam… Which one to choose?

Scenarios(2) • Consider following cases for a smart space with various location sensors deployed: • Real-time position tracking… time-sensitive and bandwidth-hungry Can system performance be smoothed? • User-optimized QoS, intent-capturing, behavior prediction, … Can system schedules and initializes services on its own initiative ?

QoS Challenges • Resource • Communication ability (bandwidth, buffer,…) • Computing ability (processors, memory spaces,…) • Energy • Traffic • Unbalanced traffic (large set of sources, small number of sinks) • Traffic heterogeneity (different reading rates for different sensors)

QoS features in context-aware middleware • To address above problems, in middleware layer, our QoS should be: • supporting priority • resource-aware and energy-aware • time-aware • user-optimized

Related Works

QoS in Service-Oriented Context-Aware Middleware • Why? • Burst traffic (services, communications…) • quality-sensitive applications (real-time, multimedia…) • How? • Application profile • Context-awareness

Selected QoS Factors • Data dissemination • Protocols, Priority, Traffic • Resource • Service, Location, Bandwidth, Active sensor nodes • Energy • Energy –efficient • Application behavior patterns • Temporal context • Service differentiation

A Middleware Prototype Fig. 1. A Conceptual Context-Aware Based QoS Middleware

Conclusion • Growing demands of QoS in WSN applications • Context-awareness enables new thrusts in QoS • Relevant researches are still in early stage • Our prototype needs further implementation

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That’s all, thanks! 26 Oct 2006

QoS Based on Context-Aware Middleware in Wireless Sensor Network