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We propose a model for heterogeneous cellular networks assuming a space-time Poisson process of call arrivals, independently marked by data volumes, and served by different types of base stations (having different transmission powers) represented by the superposition of independent Poisson processes on the plane. Each station applies a processor sharing policy to serve users arriving in its vicinity,...
Conservation laws and the related achievable region for mean waiting times are important concepts in multi-class queues. The nice geometric polytope structure of this region driven by the conservation law is exploited extensively for dynamic control of multi-class queues. Such control problems have wide range of applications in computers, communication networks and manufacturing systems. Tail probability...
Energy efficiency is one of the most important issues of Wireless sensor networks (WSN) due to limited battery capacity. In sink-centric WSN (i.e., sensing data is collected by the sink node), this issue is particularly challenging due to the ‘funnel effect’ which means high energy consumption of the nodes near the sink. While clustering can be used to achieve scalability of WSN, previous works on...
Delay Tolerant Networks (DTNs) have gained importance in the recent past, as cost-effective alternative, in scenarios where delays can be accommodated. They work well in discretely connected network, where there is no direct connectivity between some/all components of the system. But the mobility of nodes creates occasional contact opportunities. The randomly moving nodes cooperate to help a fixed...
Recently proposals are made to mount wireless trans-receivers on periodically moving vehicles. These vehicles were primarily meant to facilitate human transportation in places like large universities. The idea was to design economical networks using the already existing infrastructure, when delays can be tolerated. The salient feature of these networks is that the wireless server does not stop, rather...
Completeness of some scheduling policies with mean waiting time performance measure is used quiet extensively in literature for dynamic control of multi-class queues due to its wide range of applications in computers, communication networks and manufacturing systems. For a single class queue, we introduce the idea of 2-moment completeness of a parametrized class of policies that also have to be non...
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