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A Random Access Protocol assisted by Retransmission Diversity and Energy Reuse Capabilities
Ref: CISTER-TR-150708       Publication Date: 28, Nov, 2014

Abstract:
This paper presents a random access protocol where collisions are no longer regarded as a complete waste of network resources. Induced collisions based on controlled retransmissions can be used as a source of diversity to recover the contending packets via source separation or MIMO (multiple-input multiple-output) tools. This has been called network diversity multiple access (NDMA), which has been shown to provide the highest potential throughput in the literature. In addition to this, this paper assumes that the requested retransmissions (or induced collisions) of NDMA will be also used as a source of potential energy to be harvested and reused by the remaining silent terminals in the network. The objective of this paper is to optimize both the network performance of the protocol as well as the average energy harvested/reused per terminal. This goal is achieved by means of the theory of multi-objective optimization. The results indicate that NDMA protocols not only allow for large values of packet throughput in comparison with conventional random access protocols such as ALOHA, but also higher levels of collected energy. It is also shown that retransmission diversity allows for more flexible Pareto optimal trade-off between maximum throughput and maximum collected energy than in the case of ALOHA-type algorithms

Ramiro Robles