15 research outputs found
Stability and instability of a random multiple access model with adaptive energy harvesting
We introduce a model for the classical synchronised multiple access system
with a single transmission channel and a randomised transmission protocol
(ALOHA). We assume in addition that there is an energy harvesting mechanism,
and any message transmission requires a unit of energy. Units of energy arrive
randomly and independently of anything else. We analyse stability and
instability conditions for this model
On the Stability of Random Multiple Access with Feedback Exploitation and Queue Priority
In this paper, we study the stability of two interacting queues under random
multiple access in which the queues leverage the feedback information. We
derive the stability region under random multiple access where one of the two
queues exploits the feedback information and backs off under negative
acknowledgement (NACK) and the other, higher priority, queue will access the
channel with probability one. We characterize the stability region of this
feedback-based random access protocol and prove that this derived stability
region encloses the stability region of the conventional random access (RA)
scheme that does not exploit the feedback information
Effect of Energy Harvesting on Stable Throughput in Cooperative Relay Systems
In this paper, the impact of energy constraints on a two-hop network with a
source, a relay and a destination under random medium access is studied. A
collision channel with erasures is considered, and the source and the relay
nodes have energy harvesting capabilities and an unlimited battery to store the
harvested energy. Additionally, the source and the relay node have external
traffic arrivals and the relay forwards a fraction of the source node's traffic
to the destination; the cooperation is performed at the network level. An inner
and an outer bound of the stability region for a given transmission probability
vector are obtained. Then, the closure of the inner and the outer bound is
obtained separately and they turn out to be identical. This work is not only a
step in connecting information theory and networking, by studying the maximum
stable throughput region metric but also it taps the relatively unexplored and
important domain of energy harvesting and assesses the effect of that on this
important measure.Comment: 20 pages, 4 figure