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Supporting video communication over lossy channels such as wireless networks and the Internet is a challenging task due to the stringent quality of service (QoS) required by video applications and the many channel impairments. Two important QoS characteristics for video are the degree of signal distortion and the transmission delay. Another important consideration is the cost associated with transmission,...
All types of information may be structured as digital objects. These may be subject to rights, require privacy or demand security. Some may be inaccessible without permission (eg. Behind firewalls) may move from place to place, or exist at multiple locations. Some may need to be accessible for very long period of time. An overall framework in which to address these issues will be presented and their...
Today's Internet services are largely vulnerable to flash crowds-like DDoS attacks because the visits in such attacks often bear much resemblance to normal accesses and most of them cannot be detected with certainty. Current same-service-to-all models can hardly protect the interests of legitimate clients from the interference of suspicious traffic. Application-level quality control in edge servers...
The cognitive radio technology will allow a group of potential users to identify and access available spectrum resources provided that the interference to users for whom the band has been licensed is kept below a prescribed level. This research area is at an early stage because various research challenges have to be addressed and solved. In this talk we present an overview of some research issues...
In most designed adaptive modulation and coding (AMC) schemes the data link layer transmission rate is adapted only against physical layer channel variation. The highly fluctuating queuing process at the data link layer is not fully investigated. In this study, we first research on more advanced AMC mode selection algorithms and then propose a two-dimensional cross- layer optimization scheme. This...
We present an "opportunistic" scheduling policy with the objective of improving delay performance for time-sensitive users in wireless networks. Since packet delay depends on both resource allocation and time-varying capacity of wireless channels, we introduce a search radius (SR) into the framework of packet fair queueing (PFQ) and employ maximum relative SNR (Max-rSNR) as scheduling rule...
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