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Quality of Service in Wireless Networks Over Unlicensed SpectrumDelay Management

Quality of Service in Wireless Networks Over Unlicensed Spectrum: Delay Management CHAP TE R 4 4.1 INTRODUCTION Owing to the proliferation of mobile devices such as smart phones and of static smart sensors such as power grid’s PMU (phasor measurement units), which can run in IEEE 802.11 wireless infra- structure and ad hoc modes, it is becoming increasingly important to consider QoS delay provi- sion for multimedia applications such as real-time audio/video applications on the WiFi-enabled phones, as well as sensory applications such as SCADA (Supervisory Control and Data Acquisi- tion) applications on WiFi-enabled PMUs and their collecting gateways. The problem is that even if we consider QoS-aware mechanisms and algorithms at lower MAC/network layers as discussed in Chapter 3, it might not be sufficient to provide end-to-end delay guarantees for these applications. Therefore, we need to adopt two important mechanisms for end-to-end delay provisioning: (a) up- per layer adaptation mechanisms utilizing information from delay-sensitive applications to achieve more flexibility and get better application feedback about data differentiation and (b) cross-layer integration between upper layer (application and middleware) and lower layer (MAC, network, and OS) delay-aware algorithms. A delay-sensitive application usually has QoS requirements on two quantifiable metrics, end- to-end latency and its variance ( jitter). Depending on the network http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Quality of Service in Wireless Networks Over Unlicensed SpectrumDelay Management

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Publisher
Springer International Publishing
Copyright
© Springer Nature Switzerland AG 2012
ISBN
978-3-031-01354-6
Pages
69 –107
DOI
10.1007/978-3-031-02482-5_4
Publisher site
See Chapter on Publisher Site

Abstract

CHAP TE R 4 4.1 INTRODUCTION Owing to the proliferation of mobile devices such as smart phones and of static smart sensors such as power grid’s PMU (phasor measurement units), which can run in IEEE 802.11 wireless infra- structure and ad hoc modes, it is becoming increasingly important to consider QoS delay provi- sion for multimedia applications such as real-time audio/video applications on the WiFi-enabled phones, as well as sensory applications such as SCADA (Supervisory Control and Data Acquisi- tion) applications on WiFi-enabled PMUs and their collecting gateways. The problem is that even if we consider QoS-aware mechanisms and algorithms at lower MAC/network layers as discussed in Chapter 3, it might not be sufficient to provide end-to-end delay guarantees for these applications. Therefore, we need to adopt two important mechanisms for end-to-end delay provisioning: (a) up- per layer adaptation mechanisms utilizing information from delay-sensitive applications to achieve more flexibility and get better application feedback about data differentiation and (b) cross-layer integration between upper layer (application and middleware) and lower layer (MAC, network, and OS) delay-aware algorithms. A delay-sensitive application usually has QoS requirements on two quantifiable metrics, end- to-end latency and its variance ( jitter). Depending on the network

Published: Jan 1, 2012

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