Throughput-Optimal Scheduling in Multichannel Access Point Networks under Infrequent Channel Measurements

We consider the problem of uplink/downlink scheduling in a multichannel wireless access point network where channel states differ across channels as well as users, vary with time, and can be measured only infrequently. We demonstrate that, unlike infrequent measurement of queue lengths, infrequent measurement of channel states reduce the maximum attainable throughput.We then prove that in frequency division multiplexed systems, a dynamic scheduling policy that depends on both the channel rates (averaged over the measurement interval) and the queue lengths, is throughput optimal. We also generalize the scheduling policy to solve the joint power allocation and scheduling problem. In addition, we provide simulation studies that demonstrate the impact of the frequency of channel and queue state measurements on the average delay and attained throughput

A Survey of Medium Access Mechanisms for Providing QoS in Ad-Hoc Networks

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Consumer between Web 2.0 and Web 3.0

Along with the digital technologies’ advance over the last decade, more sales and marketing channels have emerged, causing consumers to change their habits and purchasing behavior. This paper appears in the context of such an issue and aims both to present the increasingly omni-channel nature of the consumer behavior and to identify and emphasize the needs and expectations of the customers, in line with the development of the Internet. Therefore, the paper presents the evolution of the modern consumer considering the Web conversion from a static environment to an interactive community. During the two intertwined phases of Web development presented in this paper, namely Web 2.0 and Web 3.0, customers have evolved from a highly informed and socially connected to a more empowered and engaged customer, defined by the ability to adapt and apply new technologies to meet their specific individual needs and seeking for an even emotional bond with brands. The paper also exposes how the social media landscape has generated a power shift from the business organizations toward the consumer and how social media can be a powerful tool with which consumers can react if they feel that their rights are aggrieved by business organizations