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Quality of Service in Wireless Networks Over Unlicensed SpectrumBandwidth Management

Quality of Service in Wireless Networks Over Unlicensed Spectrum: Bandwidth Management CHAP TE R 3 3.1 INTRODUCTION To achieve QoS guarantees (e.g., rate/bandwidth and jitter/end-to-end delay) in wireless 802.11- like networks is hard. Usually, these types of networks need to have in place (a) some checking (admis- sion) mechanisms for constraints and computational and communication capabilities demanded by QoS requirements, (b) resource allocation and enforcement algorithms and protocols to deliver QoS guarantees within agreed-upon constraints, and (c) adaptive algorithms, mechanisms, policies, and protocols to adjust in case of unexpected bursts or changes in demands on computational and com- munication capabilities. It is important to note, that even if wireless nodes perform checks on their constraints and start with resource allocations according to resource constraints discussed in Chapter 2, these 802.11-like networks do not yield strict QoS guarantees, i.e., there is no guarantee that applications get deter- ministically their desired QoS guarantees during their sessions. To come close to achieving at least statistical QoS guarantees during the runtime, one needs to have in place additional enforcement and adaptation techniques, algorithms, protocols, and services that provide (1) initial calculation and continuous estimation of available computational and communication resources and calculation of QoS status at times t via techniques such as optimization solvers http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Quality of Service in Wireless Networks Over Unlicensed SpectrumBandwidth Management

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Publisher
Springer International Publishing
Copyright
© Springer Nature Switzerland AG 2012
ISBN
978-3-031-01354-6
Pages
35 –67
DOI
10.1007/978-3-031-02482-5_3
Publisher site
See Chapter on Publisher Site

Abstract

CHAP TE R 3 3.1 INTRODUCTION To achieve QoS guarantees (e.g., rate/bandwidth and jitter/end-to-end delay) in wireless 802.11- like networks is hard. Usually, these types of networks need to have in place (a) some checking (admis- sion) mechanisms for constraints and computational and communication capabilities demanded by QoS requirements, (b) resource allocation and enforcement algorithms and protocols to deliver QoS guarantees within agreed-upon constraints, and (c) adaptive algorithms, mechanisms, policies, and protocols to adjust in case of unexpected bursts or changes in demands on computational and com- munication capabilities. It is important to note, that even if wireless nodes perform checks on their constraints and start with resource allocations according to resource constraints discussed in Chapter 2, these 802.11-like networks do not yield strict QoS guarantees, i.e., there is no guarantee that applications get deter- ministically their desired QoS guarantees during their sessions. To come close to achieving at least statistical QoS guarantees during the runtime, one needs to have in place additional enforcement and adaptation techniques, algorithms, protocols, and services that provide (1) initial calculation and continuous estimation of available computational and communication resources and calculation of QoS status at times t via techniques such as optimization solvers

Published: Jan 1, 2012

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