The present invention is a medium access control (MAC) layer implementation allowing cooperation in a wireless network by taking into account the operation and overhead of employing cooperation in each layer by accurately modeling the parameters of each layer as well as application-specific performance requirements.
The Cooperative MAC (COMAC) protocol framework is a strong candidate for improving the state of the art of Zigbee WSNs for IoT. COMAC brings about significant performance improvements with very simple changes in the MAC layer to allow optimal cooperation in the physical layer.
The present invention proposes a method of communication in a wireless relay network for finding group of relays that minimizes total energy consumption to send one successful bit to destination node, under reliability condition expressed in terms of average BER level, said method comprising three main phases in the manner that a reservation stage where cooperative data transmission request is made by the source node, an ACO epoch, where the announcements of the candidate relays are sent, the cooperation set is formed and power levels are assigned, and the cooperative data transmission stage itself, are defined.
The evolving Internet of Things is expected to enable the realization of wireless sensor networks (WSNs) for a variety of applications.
The term Internet of Things (IoT) refers to uniquely identifiable objects and their virtual representations in an internet-like structure. These objects can include any kind of goods, such as buildings, cars, trains, planes, machines, industrial plants, human beings, animals and plants or their body parts, all connected to form a smart environment While IoT does not assume a specific communication technology, in particular, wireless sensor networks (WSNs) will proliferate many applications and many industries. This technology is applicable especially in wireless communications and transmission systems.
A cooperative medium access control (MAC) framework is proposed for improving the performance and energy efficiency of WSNs, while satisfying a given reliability constraint. The energy-reliability trade-off is achieved through a relay selection and power assignment algorithm, which is implemented within the COMAC cooperative MAC protocol that enables the coordination of candidate relays, calculation of the decision metrics, selection and actuation of the relay nodes with optimal power levels for cooperation. The proposed cross-layer MAC framework is evaluated in terms of energy costs as well as network performance metrics, in terms of throughput, delay and overhead. It is shown that the network throughput can be improved significantly, while the energy consumption is reduced by at least two orders of magnitude as compared to standard Zigbee WSNs, at negligibly small overhead and computational costs.