tailieunhanh - Báo cáo hóa học: " Adaptive cognitive media delivery over composite wireless networks"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học đề tài : Adaptive cognitive media delivery over composite wireless networks | Farnham EURASIP Journal on Wireless Communications and Networking 2011 2011 148 http content 2011 1 148 o EURASIP Journal on Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access Adaptive cognitive media delivery over composite wireless networks Tim Farnham Abstract Over-the-top OTT content-on-demand CoD media delivery should ideally adapt to the available resources in an opportunistic manner. The dynamic nature of the Internet traffic and wireless local area networking technologies which are typical within the home must be considered in order to efficiently use resources without the need and limitations associated with centralised or fixed allocation of resources. It is also undesirable for devices to continuously monitor the available channels especially if they are battery powered. Therefore cooperation between devices and modelling of the dynamic adaptive traffic and terminal behaviour is necessary in order that the most suitable resource sharing strategies are employed. This article examines the exploitation of cognitive resource management for delivery of OTT CoD within unmanaged wireless environments. Channel and traffic models are derived based on the Markov modulated Poisson process and this knowledge is used to derive optimal resource sharing policies. Results from simulation and experimental implementation are presented. Keywords cognitive radio dynamic resource management streaming multimedia 1. Introduction The main motivation for applying cognitive resource management to over-the-top OTT content-on-demand CoD adaptive media delivery is to improve the resource utilisation efficiency through opportunistic behaviour without the need and restrictions associated with statically configured or reserved resources for individual users. The problem that can occur when OTT CoD is delivered within an unmanaged wireless environment is that unfairness can occur . one user receiving much higher performance .

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